A good start is to think about all the things you need to do to make your presentation a roaring success.
Doing a lot of the thinking at the beginning will save you a lot of time in the long run.
Here is a step-by-step guide to help you get those creative juices flowing:
Decide on a topic do you want to inform, persuade or discuss?
Think about the audience who and how many; what they need to know and what they already know.
Decide on the content consider what is relevant; allow time for research and be selective.
Decide on the structure you should have an introduction, a body and a conclusion.
Spare some time to rehearse by doing this you will identify: strong points any tricky pronunciation possible weak points or gaps how long it will take and perhaps ways of relaxing