Fellow speaker,
Talk about what you know, and give answers to the most frequently asked questions people ask you about what you know or do. For example, if you're a singer and people are always asking you, "How do you decide on what song to sing?" make sure in your speech you talk about song selection. If people have never asked you any questions, simply ask the person who wants you to speak what questions they have about what you know and do.
Frequent,
Tim
