Good job for a first wedding.
I'd echo what Steve said about the 'signing the register' shot, that's the event you need to be recording for posterity. I'd usually take one of the bride signing (or pretending to) and the groom looking on, and one of the happy couple looking straight at the camera. There are a few shots you can do around this theme - one with the witnesses looking on and one with immediate family gathered around behind the couple etc etc. For the shot you've shown there I'd have taken it from a lower viewpoint too which is far more intimate, and you'd have avoided those crazy verticals. Just bending your knees where necessary and looking for a different angle is often the difference between an amateur and a pro looking shot. Don't be self conscious about kneeling, sitting on the floor, standing on a chair, or whatever else it takes to get the shot you want.
The shots outside with the house in the background seems a bad choice of location when it seems you have far nicer backgrounds available looking at some of the other shots.
That apart it's a good job well done, but you shouldn't really contemplate these jobs unless you have two compatible camera bodies, and two flashguns as an absolute minimum, and loads of spare charged batteries. This is complicated electronic kit and if it goes wrong, people expect you to have spare gear. They wont thank you for flying by the seat of your pants on their big day. :icon_eek: