You need some level of qualification and saying you self studied the golf swing for 1000's of hours doesn't qualify you to teach. As a potential student I'd say if you know so much about the golf swing why aren't you a scratch golfer or better? How do you defend yourself if someone gets hurt while you're instructing them?
It's one thing if you want to charge some friends for lessons, it's quite another to start a business where you're presenting yourself as an expert or instructor in a field. The Dan Plan guy has over 5000 hours invested in golf and sub 3 handicap would you take lessons from him?