I know of no regulations or certifications for running a turning school.
Adhere to any local ordinances such as zoning, fire Marshall restrictions.
Probably form an LLC to protect against a major suit
Advertise in the AAW Journal.
Build a web site
Successful schools have
1. adequate facilities with housing, food, equipment
2. A faculty of top notch teachers
3. Students
1 is easy to solve, you provide breakfast and lunch and work a discount with a local motel.
2 and 3 are the chicken and egg. Good teachers teach at the best schools the best schools get the best teachers.
You may be able attract some good teachers who come to Florida very year, get Florida symposium demonstrators to teach the week before and week after he florida symposium... Maybe you know one or two top turners who would teach for you. Regardless you have to pay the instructors a going rate and feed and house them.
-al