Till this point we've made about 450 on the shop. Bear in mind though that with the bobcat bucks we gave out about 150 dollars worth of free "stuff" the first half of the year. So you're profit could be higher.
It's pretty easy actually. Identify the budget you want to use as a start up inventory. Coordinate with the principal on when and where you can set up. Get at least 2 volunteers and then sell your stuff...we order mostly from Oriental Trading
Now there are other aspects like getting a cash box receipted to the volunteers, doing an inventory, coordinating cash turn in to the treasurer and then cross check so the everyone knows how much is coming and going, setting prices etc...
We run ours once a week on Friday mornings before schools starts but after the children are in their classrooms (8:30-9:00). The volunteers have all of their stuff in a box and they set up around 8:20 in the cafeteria. The children line up and proceed through. Most of our stuff is a quarter to a dollar but we do also sell spiritwear there. It is amazing the amount of money the children come through with sometimes (like 20 bucks). We also give out "bobcat bucks" for our Spirit Award and for good Bobcat Notes. They are worth a dollar and can be redeemed at the spirit store. We have two great ladies that do this and thank goodness for their spirit. It is very popular and actually turns a profit for us...