Most of the questions you ask are about sales. What kind of coach do you want to learn? If it is an aerobic course, I suggest you go to Qiu Tong. I train my own belly dance coach. This industry is a bit messy now. You can also have a coach who feels good and learn from him personally, but you may learn better. Training schools are also good. But if you learn from someone, the teacher will pay special attention to you.