Oh...and don't forget the white water hose for your fresh water. A standard green or blue won't do. And don't forget the stuff to go in the potty. When we had our Shamrock, it had a slide the length of the camper and the mattresses were heated, which was a nice touch on those chilly nights. In our bathroom, we placed a clear shield both on the edge of the vanity (next to the shower) and along the bottom of the shower(there again, next to the vanity) to prevent the shower curtain from coming out of the shower and getting the floor wet.
Some lights to go on your awning (with clips) would also be a nice touch. Sometimes, particularly at this time of year, Target usually marks them way, way down. Extra extension cords and a couple of clear plastic shoeboxes to put all those odds & ends in. And don't forget a nice big flashlight. Make sure your propane tanks are full - nothing like going to cook breakfast and no propane for the stove. And, a lighter to light the stove (& oven?) along with matches for the campfire. Some "fat wood" is also nice for starting the campfire. Of course, don't forget the marshmallows, graham crackers, and Hershey Bars. Nothing says camping better than these around the campfire at night. And you can pick up some marshmallow "sticks - extendable - at WalMart in their camping section.
Have fun and welcome to the world of camping. I hope you enjoy it as much as the rest of us do. You'll meet some of the nicest and most helpful people in a campground.