Read The Craft of Research by Booth, Colomb, and Williams. It's full of excellent advice about how to present your work (in writing, which would also include presentation scripts).

The book is about research (obviously) and it may require a little mental translation if research is not what you do. But it is all about framing your text so that your audience will care. I think it would help you.

I can't say enough good things about the book! The same authors revised the most recent (seventh) edition of the Turabian style guide, so if that is cheaper or more easily accessible from a library, you will find most of the same ideas in its first half.