Hey
I kinda wanna marry my girlfriend right after I propose, do it at a courthouse, and then do a larger ceremony. is this a "christian" thing to do, or should I wait to plan a wedding to marry her.
Just try to do things in a way that honors parents and doesn't trample on anyone's conscience.
If she doesn't believe she is married unless she does it in a church, then she might not be honoring God with her conscience on your wedding night, and you don't want that. You want to do everything to promote her sanctification, and that will be a big responsibility if you are both Christians.
As far as wedding ceremonies go, there is nothing in the Bible about going to a priest/elder of the church, pastor, or preacher to get married. In the Bible, marriage has to do with the father of the bride-- if he's alive-- giving his daughter away in marriage to the groom. The Old Testament gives a little detail about this in certain laws. The New Testament also mentions giving in marriage.
The pagan, pre-Christian Romans had a weddings that involved the giving of a ring and saying some words in front of a pagan priest. Apparently, Christians adapted this, developing a ceremony containing some of the same elements, but substituting a church elder/priest for the pagan priest.
I really doubt the early believers had this kind of ceremony while the apostles were alive. They certainly wouldn't have done the pagan Roman ceremony, certainly not with the approval of the church. In the Old Testament, getting married to a virgin involved paying $600 or so worth of silver shekels to her father. It became the custom to have a wedding feast, as we see in the time of Samson, and later in the time of Christ. The Jews also had a practice of a man writing a kind of wedding contract for what he agreed to provide for his wife.
But, you may have some relatives that believe a preacher has to say certain words for you to be wed. You certainly want your marriage to be honorable in the sight of men. You don't want people thinking ill of your bride.
If you had a small ceremony, it's not that hard to get a preacher to perform one if you know some of them, and your wedding isn't being done under scandalous circumstances.