Learn the tax code.
Keep pristine books.
Pay what you owe, when you owe it.
Biggest issue would be dealing with all the inspectors, FDA, etc. as an example, the City of Fort Worth has been trying to shut down a dairy that sells whole unpasteurized milk, even though they are not located in Fort Worth. The rationale is that the city prohibits the sale of such milk, and since people go out of the city, they are treating the dairy like a drug pushed.