Once you clear the basic AFF skills (usually 7 jumps) you can start self-supervising. You will have to perform a few coach jumps, and at least one jump with a jumpmaster (your A license check).
Coach jumps I have seen range from free (some people just like to mentor and pay for there own ticket) to $50. It seems usual that if you hunt down a coach and buy a ticket, you're probably good to go.
I've seen people clear all their skills in 1 packed coach dive (docking, swooping, alt adjust, tracking) but it probably should take 2 or 3 coach dives.