What's the starting point when you're creating any PowerPoint presentation? It should actually be the same starting point you have for any presentation that is asking yourself this question. What is it I want my audience to do? After hearing me speak, critically important to many people just start off with, oh, let me gather lots and lots of data. Let me get a lot of slides. Let me get all the slides we use last month on this.
No. You need a singular focus on what is it? I want my audience to do, think about it. Write it down, type it up before you do anything else.