Converting a presentation to an online course?

I did a one-day workshop on how to start-and finish-your novel, and I had thought about turning it into an online “course” people could purchase. I think I have seen this done. Is this the type of thing people are interested in, knowing there will be some audience interaction and (a lower price to compensate) for 4 hrs of content plus Q&A? Unfortunately, the two teens there talked and interrupted more than I expected.