I recently looked into all of this down here in Florida... What I have found out, so far, is that the requirements can vary from county to county and I was also surprised at how many people, whom you would think "Should Know" ... Didn't have a clue and some were unable to answer questions at all.
I would need an inspection and certification for the area I would be prepping and cooking food, a business license, food vendor permit, current certification as a "[font=Verdana, Arial, sans-serif]Food P[/font][font=Verdana, Arial, sans-serif]rotection Manager",[/font] and meet another full set of inspections, fees, & g[font=Verdana, Arial, sans-serif]uidelines for a "Mobile Food Establishment"!! [/font]Not to mention the insurance requirements to sell food!!!
I would start with google for your state and search "food vendor permit" Good luck!