Where can I get the service training necessary to be a food server in a restaurant?
You want to find a college course in Hospitality. There, they train you in all the front-of-the-house responsibilities and proper waiter etiquette.
If you're looking to wait tables at a burger joint, then you probably don't need to go to college, but if you're looking to land a job in a high class kind of place, then you'll need thebackground.
Ask your friends if any of them or their parents have experience otherwise most restaurants will train you.