How much should I charge for a Wedding Video and Photo Shoot?

Okay, so I'm 18, and I've been editing film and photography for a long time now. I'm no professional, but I'm decent. So I decided to try and get a small quasi photography/filmography business going. One of my friends asked me if I could do a wedding shoot for her cousin. Then, she asked how much I would charge. I have no idea how much to tell her. It's my first shoot, and I don't want to charge too much. Please, I need some help. I don't want to name a ridiculous price because I'm no professional, but I would like a good amount. Any help would be very appreciated. I'm trying to work my way through art school, so I need the money.