The things everyone mentioned are great but a few extras might be folding chairs, mat for outside, griddle and cooking supplies for outside (we enjoy cooking outside), wood and things for campfire just to mention a few. Another thing we have found needed is windbreaker for the cool mornings.
We always camped at a CG close to home when we got a new RV. That way we were not too far if we needed to run & get something. Some people camp on their driveway the first couple nights and they are even closer.