Great idea.

I would start by either buying a used cart, or if you are creative and have a Northern tool or something like that around you, build the cart yourself. A little creativity and you can create a cart for under $1000.

If you live close to the school and like riding your bike, hook it to the bike and you have no added gas cost.

There is a guy in town near us that sells coffee by the park downtown. I sat there one day and watched him pull in about $120 in an hour.

One thing you could do for customer retention is build in some sort of frequent flyer card. Anything you can do to get people back in front of you is key.

Now get out there - there is money to be made!