In terms of legal structures, look to see if your local jurisdiction has a social benefit or public benefit corporation that you can legally register as. They’re like an LLC, but place a social mandate of some kind above profit making. This is legally built into the charter of the business, meaning it can be enforced in the courts if later on the business attempts to violate that mission. It also allows such businesses to qualify for certain grants.

Municipal scale infrastructure to capture waste, treat it, and extract nutrients to be redistributed or sold as fertilizer. This is usually an activity undertaken by and fit into existing municipal waste infrastructure.

I like to chop it up, fry it with onions, and put it in burritos. Breakfast burritos especially with egg, bacon or sausage, and cheese. It can also substitute for turnip or collard greens in a recipe if you’re looking for a place to eat it. Since its more of a bitter plant, you’ll want to use it much differently than spinach (whoever told you it tastes like that deserves a stern talking to)

Wait until you get into food preservation!

I figured there were some issues like that, I think I’m more into the general idea than this specific execution