Young Couple With No Money!! Please Help!

My fiance and I are both very young- he is in the military and 21, and I am an 18 year-old full time sophomore in college. Needless to say, we have NO MONEY! Our parents will help, but his don`t have much money to spare (4 kids left in the house!) and mine are spending all of thier money on my education. I need some cost-cutting ideas for a simple, but elegant daytime wedding next May. I don`t even know where to start! How much are churches? Reception sites? Do we HAVE to have a meal catered? Or could we just do snacks (and fancy them up a bit, of course)? I don`t know anything about planning a wedding, and his parents and mine both eloped! (Which is a possibility that we are not ruling out!) Any help at all would be greatly appreciated. Thanks so much!