I'd love to answer this--it's the sort of "tell it to me straight" kind of question that I really like. I have no idea though. I don't really know you well enough to assess what I think you could teach. I can give you the generic advice that you can do whatever you want to, so just figure out what you want to do and then do it. With a little research and dedication, you could learn any topic well enough to teach it. As far as what you already know or what marketable seminar skills you've got, I really don't know.