NAFAA.org has a bunch of good info on it, also Tedward can help coach you on how and who to talk to for most permit stuff. A good start is insurance from Clowns of the US. The second would be to see what your city and state fire marshall require as far as registration. Our group first had a city of Reno fire marshal permit but then we grew too large and we were turfed to the state fire marshal who permits pyrotechnics etc. Wh had to work with them to create a Fire performer category for registration. In addition to this the venue usually needs an open flame permit and depending on where they want you to perfrom they may need a special use permit which would be needed for any venue at the same location. Hope that helps.