There is no need to go through the formalities for general training courses. Unless you use a store or want to run a training school, you need to apply for a license. There are also different cities and locations, and the housing rents needed are also very different.

Cost: rent+utilities+painting tools (sketchpad, easel, plaster, still life, lighting, etc., I don't need to elaborate on these since I want to start a class)+teacher's salary (the salary of students at school is relatively cheap, so I can recruit some students from famous art colleges to do publicity).

Other expenses: hiring propagandists, paying property and other miscellaneous expenses, purified water (for students and consultants). ...