What can I expect if getting married during leave between AIT/Airborne and first duty station?

I'm currently in AIT (U.S. Army) and once I graduate from here I will be heading to Airborne. Once I finish with Airborne, I plan on taking a couple days leave and going back home to marry my girlfriend. I was wondering what to expect once this happens. How long will it take before she'd be allowed to move in with me on base, and how would I go about getting my status changed so that the base knows I will be needing housing for two, not for just myself? Also, if after Airborne my orders come through and end up being overseas, how do I go about making sure she will be able to accompany me there?