How can I have a nice marriage young?

I'd first like to say that I don't want anyones opinions about me getting married so young. I am currently 17, a high school senior. Me and my boyfriend want to get married, and he is in the military. He's just finished basic training and still has AIT and Airborne training. He'll be finished with everything in about March. Well, I graduate and turn 18 in June, so for the moment I don't plan on getting married until then, but if something happens, we will most likely get married before i'm 18. And my mom already approved. So I don't necessarily want to have a court wedding, but I know i'm not going to have anything extravagant (and that's perfectly fine), but how could I have a nice marriage that would be pretty traditional and have our closest relatives and friends. and what exactly would I have to do to get it?