if you can tie your own shoes, they'll take you. Just walk in, say you want a job, they'll give you an ASVAB, you need to at least spell your name correctly to get a job.

You will go to a recruiter and fill out a bunch of paperwork and be asked some screening questions before being scheduled to go to a MEPS (military entrance processing station) where you will take a basic standardized knowledge test (ASVAB), go through a medical screen, and to through a final interview there with another recruiter after passing the former two steps. You will sign your enlistment contract in that second interview.