Hey good luck Wampus. I've been the same boat as you for while now debating making the jump into the biz side of things. I just started with small catering gigs for friends and will let it grow from there. There is a great podcast in the BBQ Central Radio archives about bbq catering and the biz side of things. Google for "Getting In To The BBQ Catering Business". There is another more recent one about starting a brick and mortar shop but i can't seem to find it right now. Dig and you'll find it. Good luck!
BBQ Central Podcasts:
1. Getting In To The BBQ Catering Business
2. March 2nd 2010 Episode - Steve Forman