Simple, 1) Pass a General Exam 2) Clean Record (you can have a small criminal record. Just not library of crimes) 3) Clean Credit Report

Go to the recruiter and they set you up on the process if you qualify. Less than .05 percent of the United States population is Military, even less United States Air Force. Each career field has it's different specifications, and the Air force makes career selections based on need. So not only do you have to be qualified, but to get the job you want you have to be patient. The recruiter will try to put you wherever is most convenient for them-- do not let them. Choose wisely, and assertively for yourself!