The best way to address a business audience is as if you’re having a conversation with someone. Don’t “present.” Don’t be theatrical. Use humor, stories, and solid examples to support your points.
Don’t stand in one place, move around. Smile. Take questions. (Can you imagine talking to a friend and saying, “Please hold your questions until later, if we have time.”)
Don’t use PowerPoint, which is hackneyed and removes the focus from you. Don’t use handouts that divert attention.
If you can’t speak easily (and even extemporaneously) for an hour, with questions and responses, on your expertise, well then, you’re not much of an expert.