There's a lot of territory to cover there! But start here:
Inspection & Compliance
A year or two ago, I attended a meeting and talk about food safety. The talk was for owners of small businesses engaged in food production. It was very interesting but it did not cover food safety, merely the reporting procedures along the way to gaining permission to sell a food. Food safety starts in the manufacturing environment or on the farm or the packaging operation. There are so many regulations on different levels (state, local, national) for each type of product that I wouldn't know where to begin.
Labeling is very important. You can't sell food without information that would help a person with allergies, for example.