This is my second year cutting 2 good yards. I am a wood shop teacher (with summers off) and enjoy lawn care. I Have three acres myself. My question is (1) How much money should I be bringing in a month before I get an official business? I do plan on doing this for MANY years. (2) What kind of hoops do I have to jump through to have a real business? I would be happy bringing is $300.00 bucks a month. I am not out to quit my job and go full time. I think I have the best job in the world next to Hugh Heffner. Lastly (3) Can I have signs on my trailer if my business is not legit? Your help will be greatly appreciated.