I was approached by another Colonel's wife who asked me to shoot their son's wedding at the post chapel tomorrow morning. Talk about short notice! I agreed to do it. She asked me how much I normally charge and I simply told her that I would shoot the wedding, process the images, and review them with her. If she liked what she saw then we can discuss pricing. I'm thinking of charging them maybe half of what the average cost of local wedding photographers would charge if the images turn out good.
You take great photos based on your posts here...you are not in over your head. Worst case, figure out a price based on your hours worked and work from there. You have a great eye, consider this your first step in professional photography.