I imagine the training arena would be something quite a bit different... something which can help the new players practically, teaching them in the basics and skills they would need to survive and accomplish the missions.
I imagine it would begin with the most simple, take off/landing procedures, and progress through some basic maneuvers, tips on how to keep formation, manuals and trainings on rocket firing, dive bombing... shooting at drones for aerial gunnery and ground attack gunnery and etc..

I hope it can be an interesting "course" that can teach people practically, and also with a spot of humour and fun

Maybe like 'obstacle course' with gunnery targets in between the courses and etc etc...