Dogs on Wheels
I own three carts and I work one and have hired 4 other people. Mainly college kids. They have shifts and it works great. Its a little time consuming counting everything exact to make sure there is no theft but its well worth it.
You have to go into this way.
If the location you have breaks even everyday and you dont lose money, than you win.
You will have a location being built and see if it is beneficial until you could maybe make it full time. The only problems will be, being able to be consistent and gaining regulars. I have found my personality helps my buisness.People like to see the same face and get to know you.