Instead of a relaxed arena, I'd rather see a training arena that the new people would have to pass certain criteria before they could move on to the Mains.
Successfully pilot their craft through an obstacle course ( both a plane and a GV), level bomb a target with at least 50% damage on a run, dive bomb a target with a single hit, go to a "radio room" and tune a system channel to send a "coded message". It doesn't have to be brain surgery, but at least cover the basics enough that when they hit the Mains they have a general idea of how to get around.