A friend asked me for a few tips on presenting, so I jotted a few down. I'm sure this will be useful to someone out there - sorry if its a bit random, it did it off the top of my head!
Planning the presentation
The top tip is don't use any slides at all - it takes a huge amount of confidence but if you can do it you will make an excellent presentation. People want to get engaged with you not a projector. But I think for a first time thats a pretty big ask so lets assume you want to do some.
don't do too many slides. Doing too many is a mistake as you will feel the slides are rushing you. You should have one slide for every 3-4 minutes of your presentation - but the longer your presentation is then the time between slide should reduce (otherwise people get bored).If you are doing a ten minute presentation 3 slides plus a title slide is enough. should be the absolute maximum. A 20 minute presentation should be 7-8 slides at the most. A 30 minute presentation can be 15 slides. Anything more than 30 minutes and you are getting into a whole different type of communication. I am assuming that is not the case for you so lets assume you have less than 30 minutes.
Each slide should not contain too much information. As a rule no more than 5 bullet points with no ore than 10 words per bullet. People want to hear what you have to say - don't put everything you are going to say on your slides - if you do why would they bother listening to you - you could just email it to them. Also if you put a lot on a slide the audience will start reading it as soon as it comes up. Often this means they will stop listening to you so they can read it.
You bullet points should read like sun headlines. A good sun headline bullet point is four or five words. So its impactful, says what it means but leaves the reader wanting/needing to hear more. That will make your audience listen to you.
A presentation should tell a story. A story has a start, middle and an end. The audience should feel like they are being taken on a journey. Start with what you are going to talk about - give the audience a heads up. You don't necessarily put this on the slide, you can say it. Then you want to set the scene, then give them the detail and then summarise.

Open a blank power point presentation and open as many slides as you are going to need. So lets say for example you are going to do 4 slides. Make a title slide and 4 empty slides. don't worry what they look like at this stage. Your first job is to work out the title of each slide. The titles should seem like they flow as part of a story and answer the comments/questions raised on the previous one.
Once you have done that jot your thoughts down as bullets on each one as to what that slide should contain. You will find that those notes will probably form the basis for the bullet points.
When writing the slides imagine yourself saying it. What do the audience want to know about - don't tell them crap they are not interested in. Will they understand it - don't confuse them, you may need to more explanatory if they are new to the subject. don't treat them like kids - nothing is worse than listening to someone talk about something you already know about, they are al professionals - tell them things they don't know.
Once you have the bullets on the page you need to make it look pretty. This helps people stay interested in what you are saying - especially if part of it is something they already know about. A slide coming up with four bullets and a picture is a lot more exciting than no picture. The image doesnt have to say anything, although it is good if it helps to explain something on the slide. It can just be an image of a document if you are talking about legal documents for example. It just adds a bit of visual interest.
Before the presentation
The best way to feel relaxed about your presentation is to be confident about the contents. Rehearse. Stand up in a room with your slides and rehearse. Pretend there is an audience there and go through your presentation five times. Say things out loud, even if you only whisper it - because it takes longer to talk than to talk in your mind. Time each presentation. Make sure that if you have 10 minutes your presentation only takes up to 7-8 minutes.
If you are really not confident write yourself an entire script of everything you will say. Then memorise it, and practice reading from it over and over again. This will make it more of a reaction than something you have to remember. When the words become second nature you can focus more on your delivery style.
Then take your script and boil it down to a few key sentences. This will act as a written prompt should you forget where you are while presenting. They should be different to your bullets - these points are what you are actually going to say rather than what they are going to read. Here is an example of how I would boil down one paragraph:
If this is what I am going to say "Hi there, I'm Owen Geddes. Over the next ten minutes I am going to talk to you about how wireless broadband is going to change the lives of millions of people in India India as a country has a huge population of over a billion people, that to a large extent are unconnected. However the country is growing through huge growth in economic terms, which has a knock on effect with communications. The country is leap frogging whole technologies and as a result is perfect for wireless broadband. It has only about 4 million broadband subscribers, but has over 150 million mobile users, of which over 40 million regularly access the Internet via their phone. The population has limited fixed infrastructure but there is a desire for connectivity. Laptop sales are increasing 100% year on year, with virtually all of them being WiFi enabled. With major cities housing tens of millions of people and densities of 20-50k people per square kilometer there is a clear case for wireless broadband."
This is the notes I would have to go with this:
Get a set of notes written up - so the words are big. When you present you will be surprised how hard it is to read anything if you panic - everything seems too small and long. So make your notes short, big text and easy to understand. You will have these notes by your side when you present. They will be your comfort blanket if you don't feel confident at any point.
Making the presentation
Before you start remember people have come to listen because they are interested. They have not come to pick holes in anything you do. They have come to learn. The best thing you can do for them to make them happy is make it short and interesting. If its short they will love you.
You are going to want to be mobile when talking if possible. It helps if you are standard and you can move around a bit - it helps to loosen you up and makes you more interesting to look at. So find yourself a space when you start.
Don't rush. Its not a race - half the words at half the pace is appreciated. Nobody wants to have to struggle to keep pace with you. Remember you know what you are talking about but they might not. So make it simpler than you would normally and go at half the speed. Talk at a speed that you think is almost embarrassing. Go at the speed you in your mind makes you appear to be a retard. Believe me on the outside it will be just about right. A slow deliberate presentation comes over as very, very confident and relaxed.
Remember you are in control. When you have the stage you are king. You are the authority and you have the right to be talking. You control the audience. They will do as you tell them within reason. If you are lively they will be lively. If you are boring they will be boring. 95% of people don't want public confrontation. remember if someone asks a question they are not trying to be awkward, they just want to know. don't panic if they ask something. If you know the answer, tell them. If they don't tell them you find find out and let them know later. If someone is in any way confrontational just say "I understand your point. Its probably not for discussion here, lets discuss it together after the presentation". If they try and push any point after saying that they will appear unreasonable, selfish and to be disrupting the presentation and the audience will side with you, and often take action themselves to stop the person.

If you tell someone to shut up in that room (nicely of course) - 99 times out of 100 they will because you are in charge. They know the crowd will turn on them if they don't follow your very reasonable requests.
When speaking take breaks. Every now and then stop and take a deep breath. better still have a glass of water on the table. Every now and then stop and take a sip. This gives you a few seconds to organise things in your mind and plan what you will say next. It may seem like an eternity when you are doing it - the audience will not even notice you do it. If you forget what you were going to say next take a sip of your water, and then take a deep breath whilst looking at your notes and carry on.
Nobody will mind if you forget something for a second, stammer or get a word in the wrong order. Everybody sat there knows its hard standing up in front of people and most of them are glad you are there instead of them. As a result they have no problem if you stumble a bit - they wont hold it against you or laugh. nobody expects you to be perfect - you are not a trained public speaker.
Make sure you use your hands a lot - don't wave them around wildly but enough to look animated. In turn that will help your voice sounds animated. You don't want to sound monotone - you want to sound enthusiastic. Let your personality shine through. Be you not a robot. Use a little humor if you can. Its not unprofessional, and makes everybody relax and warm to you making your job easier. Heads of state do it, CEO's do it - its not unprofessional - its human, and that is key. Be a human being and people will like you. If they like you they will forgive anything to you say or any mistakes you make. Everybody by nature wants to be in a pack - in modern day this means having friends. When you are stood up in a room you are effectively head of the pack for a short period. therefore people really badly want to be your friend as that means security for them. remember that - they want to be your friend.
Be casual. Chances are you will be nervous which will make your appear stand-offish, up tight and not likable. Imagine you are in your jeans and t-shirt and the room is your friends after a couple of drinks. Just relax. don't worry about nerves by the way. The one thing that will make your presentation brilliant is the adrenaline surging because of nerves. It heightens your senses and allows your brain to operate much faster than normal. That helps.
After the first minute of talking allow yourself to enjoy the moment. You didn't get swallowed up and die, nobody laughed - its actually ok. So smile and enjoy.
At the start of the presentation just smile and say "hi everybody, I'm xxxxx from the xxxx team. In the next ten minutes or so I am going to tell you about x". you will feel immediately relaxed after just that. So will they.
Don't go too fast. If you do you will leave lots of bits out so not only will bit be over fast because you are talking quickly, it will be over even fast because you left whole chunks out. I have seen ten minute presentations go in just two minutes and the presenter is left standing there wondering what to do next because it made no sense because they forgot half of it.
If you forget something go back and cover it. The audience doesn't know the order you originally intended to speak so they wont notice. This is the same for all of your presentation - they don't know what it was supposed to be like so if you make mistakes or change things they wont notice anyway.
However you think its going, its going 5 times better. That is not a guide - that is fact. If you think its dreadful they think its ok. If you think its ok they think it was the best presentation of the day. If you think it was great they will think its the best they have ever heard.