Keep it simple, and keep it clean. Customers become hyper aware of sanitation and cleanliness when they look for food they’re going to potentially ingest. You eat with your eyes first, and everyone knows quality has a lot to do with perception. Keeping the total number of food choices available to a relatively small number, around 3-5, will help preventing biting off more than you can chew in terms of keeping up with the flow and cleaning the food station.