I've done this. For me, 10 people is way too many - they'll all be at different stages, learn at different rates, need to have the most basic stuff explained, ask stupid unrelated questions. Even if you put out a synopsis, a detailed list of what you'll go over in every class, they'll either be bored or bewildered. And you always get a know-it-all who wastes time explaining everything his way.
One thing to think about is making a video of each of your segments, running the video, and then answering questions. You can at least get the basic information across without interruptions.
For your lesson plan, you need to make it flexible - sometimes you spend the entire time on point number one, sometimes you zip through the entire thing and need to fill in with additional material. You never know. Be prepared.
Always bring an assistant, and never close the door. Never be alone in a room with one person - you'd be amazed at what people can accuse you of. Abuse, stealing, who knows what else. There are some crazy people out there. Of course, there are a lot of wonderful people out there too.
It works best if you offer a "course" rate (no refunds), for all however-many weeks you are teaching, because people will drop out.
Good luck.