In Ohio they have a certification through the local Agriculture department where they will send a health inspector out.
1. Not have pets
2. No carpet in kitchen
3. Be clean
What this will allow you to do is sell baked goods (pies, cakes, muffins, breads, etc.). BBQ related stuff...you can sell rubs (no hydrogenated) and dry injections (no hydrogenated or preservatives).
You cannot sell sauces...must have a commercial kitchen and separate license for that.
My wife just got hers on Monday and I was surprised that they would allow you to package rubs.
And yes...you can sell the rubs and cakes, etc. to restaurants.