The best starting point to developing a presentation is to establish why the presentation is needed analyze the intended audience decide what to include in the presentation gather information

The answer would be : Establish why the presentation is needed.

Whether it's to attract investor or for simply give an information, you can decide what should you put on your investor , after you determine what do you want to get from your presentation. If you want to attract investors, you should probably filled it with future cash projection. If you want to give an information about your company, filled it with your company's vision and mission