It all depends on were you are...
When I was in MA I had to register with the state.
I moved to NH and was told to go threw my town office, I called and they said in my town, I don't have to do anything to register just sell... I live in a farm town and most of the land here is farm that is how 99% make a living..
Start by calling your town mine goes threw the building inspecter (again small town so yours may actuly have a dept for small business)