It's often hard for someone starting a food concession to know WHERE to start. I believe they should start with EVENTS. Before they plan and design any other part of their concession business they should research and become familiar with the type of events they plan to do business at. This is important because, operation-wise, different concessions are more practical and successful at different types of events.
I'll explain, but first let me start by clarifying some lingo:
Food cart - does business from a fixed location such as at a food pod or parking lot. On a day to day basis a food cart serves a steady clientele and operates much the same as a regular storefront food business. A food cart starts by pursuing the ideal permanent location for its business. With a good location found, that job is done.
Food concession - does business at various short-term, albeit sometimes multi-day, events and venues such as special events and county fairs. Concessionaires must pursue multiple locations (events) every event season.
That's all simple enough. But for concessionaires; here's the hard part:
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Source: http://www.foodbooth.net/