Power point presentations can be an excellent way of showing facts, gaining and keeping the interest of your audience and showing what you know.
They also require knowledge of techniques that you may be unfamiliar with. You need PowerPoint and Smart Art as well as know-how about changing colours, inserting pictures, changing sizes etc. At that is beside gathering together the information you want to get across and getting it in some kind of order.
You need to consider your audience: "Am I trying to convince or inform?" Perhaps a bit of both while at the same time being entertaining... It's a hard task even to contemplate.
Perhaps you ought to consider calling in professional help. Whether you want them to use your material to create a presentation or indeed come up with the whole presentation it will make life considerably easier.