Are you talking about selling your wares in the buildings or out front? Inside, you'll definately need permission or a permit. Outside, dunno, depends on the local govt. Research your permit/permission needs first. Health Dept issues, if any, might make it more trouble than it's worth, IMO. Check the prices of the mass produced stuff already available to the locals and don't price your stuff too high above that. Yes, yours is better quality and much tastier, but busy folks might not care about that if your muffin is twice the price of the plastic wrapped one.
Chris