Try out a couple of different tools, and find out which one works best for you. Some ideas:
- bullet points (on paper or computer)
- mind maps
- powerpoint slides
Practice, practice, practice! Mirror? Fake audience? Real audience? Camera? Toastmasters? It is all about practice!! The more you do it, the better you will get. Especially if you get some valuable feedback and ideas for improvement from your audience.
What keeps the presentation interesting and memorable
Find stories, analogies, quotes… Use your imagination. You have a vast amount of resources and ideas available on the internet and in the books. Perhaps it might be useful to check out the list of resources here: Great resources