Depends on what your aspirations are. I started off with little craft fairs and trade shows where I could sell it in a little mason jar and didn't need anything fancy as far as prep, labeling, etc. is concerned.
Once taking it commercial, however, it required* a little more effort. GSN (UPC) registration, trademarking, nutritional information, labels, professional packaging, FDA approval, etc.
What I do is VERY small time for the moment, but if you want to have any discussions, you are more than welcome to PM me and I can share my experiences.
*I say required, but not everything was necessarily legally required. Professional packaging, FDA approval, GSN registration and such add legitimacy if you're trying to get on store shelves and run it like a true business.