Farming and Selling Grain flours as a Small Business

For the longest time I’ve thought about selling dried grains and flour for human consumption. Either at farmer’s markets or a at home store. However, I realize it’s not as simple as selling produce, because there are cottage laws and regulations for farming, storing, and processing grains. I’m wondering if anyone has tried it. Is it possible to do at small scale from home? And how do I research regulations and equipment that can be used legally?