To drive a GV, you need to shift with q and w. Press the joystick forward to go fast, back to slow down. Joystick right and left to turn.
There is not much to do once you hit the ground after a bail. Just go back to the tower by ending the flight. Grab a fresh plane, and get revenge
Depending on where you bail and exit, you could be captured. You could walk back to your field, but that could take hours.
I think there may be plans in the future to expand the ground war, but at this point, there is not much to do.
Gunner