I've always wanted to start my own lesson barn, but I don't have the funding at this time. I'm thinking maybe I should see if I can build up a client base of people who would like lessons on their own horses and maybe assist with training (or teaching people how to train their horse). If I ever have the money, I would like to buy a few ponies and start a children's lesson barn.
The only issue is that my teaching skills are rather rusty and I've spent more time starting green horses than I have working with advanced/well trained ones. So if it is someone who is showing at a higher level, then I probably won't be much help (although someone like that can probably pay for top quality lessons at a show barn).