I can never figure out why so many military haters hang out in the military section.....
If you know for a fact that you are marrying him then you should marry him BEFORE he ships out, even if it is a quick courtroom ceremony, and do a proper ceremony after training if you wish. If not, he will loose out on BAH and separation pay he could get for being married. Click the link below and enter your ZIP code for the rate for your town and that is what he will get extra per month while he is in basic for being married to you. He will also receive $250 a month after 30 days.
After he finishes training he will go to a permanent duty station for an average of three years and will most likely deploy sometime during that period. He could also end up going overseas to Germany or Korea. You have a choice of either going with him (unless it is to the Middle East or certain parts of Korea) or staying where you are. Your life probably won't change too much, you just have a lot of military jargon to get used to. You will most likely have a strong FRG at your future husband's first unit to help get you ready for military life.
If you don't marry him before he ships then he cannot get base housing or BAH until you and him marry. He will be forced to live in the barracks until he shows a marriage certificate and you will be ineligible for Tricare, DEERS enrollment, and PX/Commissary privileges. If you marry him now and there is a base close to where you live then you can take advantage of these things the day he ships off to basic, you won't have to wait until he finishes training. Even if there isn't a base close by you can still use Tricare at any medical facility that accepts it.
EDIT: If you want experience I can tell you what I had: I got married before my second tour in Iraq, my wife and I talked and e-mailed each other almost every day, and after I returned we got back together and enjoyed our time together until my third tour. She got a job and and she is going to school at the same time to better herself. If you plan to stay where you are to get your degree and he marries you his BAH will change to the rate of his first duty station unless he goes to an overseas base like Germany or Korea (not Iraq or Afghanistan). He will still have to move out of the barracks even if you aren't there and he will have to get an apartment in addition to sending you money. You will have to occasionly deal with gossip and rumors while at the base. You will hear rumors about who's cheating on who back at home while he will hear some of the same rumors while deployed. It is different than being married to a civilian but it only requires a few adjustments.