See a recruiter. Don't be overweight. Pass the ASVAB (basic highschool math, grammar. some mechanical, clerical, electronics skills). Pick a job. Pick a date. Go to boot camp. Honestly, if you don't have any felonies, graduated high school, aren't obese, can run, do pullups and situps, you can probably get in. We need good people so if you want the challenge, go for it.

Talked to a recruiter within a week I was enlisted, that's the recruiter's purpose. He asked a few questions about drugs, alcoholism, violence and physical fitness and any history of me being involved in crime. I passed the interview and we moved on with the recruiting process.