Be early for set up - assume you can't move your car.
Park one car in the non vendor area
Starting bank of no less than 300.00 of singles and 5s
Sunblock
Water
Rolls of TP
Pop Up Wipes
Guest Book
Sale Book
SWAG
Staple Gun
Office SUpplies
Tarp

Price all your items w/ sales tax included
Do not over pack and remember how hot it will be, when you pack those dildos.

But most of all .. have fun!