Hi Claude,
I'm afraid I'm not going to be very helpful to you because I'm just getting started also. But I was just going to start a thread about pretty much the same thing, so I'm just going to read any responses that you get.

My main question was going to be this......are high school names and mascots free game for everyone? I have read enough to know that I won't be able to do collegiate t-shirts, but what about my kid's highschool? Can I use their name and mascot for tees?
Good luck in your business!