Know your purpose
Does your presentation aim to inform, persuade, or entertain?
Knowing what you aim at determines the tools you use.
If you intend to inform and you have an idea of the level of knowledge the audience has on your topic, you can start by introducing key concepts and then explaining the relations between them.
If you intend to persuade, then you can start by stating out the problem, then continue with solutions A, B, C and their benefits and drawbacks.