Everything zondaracer said, plus if you're really sure that's what you want to do, consider enlisting in the unit you would like to fly for as a crew chief or something else where the ops guys will see you regularly and get to know you. I sit on most of the UPT hiring boards in my unit, and folks who are already in the unit get a guaranteed interview. If we know them, like them, and think they'll make it through the program and be a good fit when they get back, they've got a HUGE leg up on the competition. That competition is largely guys off the street like yourself who've got flying experience, but we don't know them. So the choice becomes bet on someone you know, or someone you don't.