Traditional Culture Encyclopedia - Photography major - What documents do I need to set up a photography studio?

What documents do I need to set up a photography studio?

I'm in a rural town, and no one asks. If I am in a city, I need a business license (now it is a combination of three certificates). I can do it on campus, as long as there is room. No problem. When I was in college, I opened a photography studio at the school gate. I don't have any certificates, and no one asked. Is this illegal?