If you're interested in a church wedding, it's possible to be married in a church and still keep expenses down. My husband and I were married when we were just barely out of school, and we were planning everything on a student's budget. We were married in his church, with a simple finger-food reception afterwards in the church social hall.
We were engaged for about a year and a half, but some of the reason for the long engagement was that we were waiting for me to finish my thesis (which took forever, sigh

). I do recommend premarital counselling by a pastor, which for us was stretched over a few months.