Don't take this the wrong way please: based on your questions I don't think you are ready to tackle vending. Get some practice cooks replicating the vending environment under your belt.
BWS Party |UDS|Great Outdoors Propane Vertical|Maverick ET-73 |Maverick ET-732 |Super Fast Orange Thermapen | BBQ Guru DigiQ |Two 100 QT crawfish boiling rigs | LEM Meat Grinder | Grizzly Sausage Stuffer
Smokin-n-Style BBQ Team - Pitmaster
Lagniappe Chili Team - Head Cook