Hello, and welcome to the forum. There are many, many PDI (pre-delivery inspection) checklists out there on the internet. Here's one, for example:
http://www.angelfire.com/trek/buenav...s/PDI_V113.txt or
http://www.eaglecapowners.com/camper...Inspection.pdf
Just do a Google search on "RV PDI" or "motorhome PDI" and you'll find quite a few that you can use as a starting point. Above all, do not let the dealer rush you through your walk-through - make them take the time to thoroughly explain each system to your satisfaction, ask questions, and take lots of notes. I also take pictures of things as we progress through the walk-through. In times' past, I videotaped the entire walk-through so that I could go back and refer to it later on.