Amy - what a cool list of ideas!!!!

Not much to add except you may want to think about Business cards and a smart phone card swipe (PayPal's I beta tested and it's great NOT the Square it's unsecured). A cash box with some 10's, 5's and a ton of 1's. Sales Tax license? Are you required to collect it etc...

Sounds like tons of fun and all the best wishes for a BIG success!

:-Debbie