You can learn alot watching Dragons videos on JTAC.
Part 1
Part 2
Part 3
Part 4
I also found zAmbOni's Devil's Cross campain missions very helpful, he has 5 posted so far. All of these videos are over an hour long of unedited raw video, I linked one below, im sure you can find the rest if you like them.
DCS A-10C: Warthog - Devil's Cross 01A