Just walk in and sign the dotted lines. Make sure you know exactly what your doing. Do your research on whatever it is before you regret it later on. There is no 'interview'. As long as you graduate high school and don't have any criminal background, everything else will be easy and done for you.

I was recruited out of high school, the process was easy and straight forward. I was in the DEP for 6 months and continued to work with my recruiter to choose the path that I wanted.