Questions about enlisting in the guard after college with a Rep 63 Contract.

[SC45]

Gentlemen,
I appreciate all of your help. After much thought, I have decided to enlist with a Rep 63 contract after graduation. I will be graduating with a degree in Mechanical Engineering and was wondering if it would be best to get a job before I enlist, or enlist right after graduation and start the job search after I've finished my military training? Thank you.
-SC45