Biggest things to check are:
1) SAFETY (new tires, fire ext., fire alarm, CO2 detector)?
2) Water leaks? The entire outside should be sealed from the inside in one way or another. Nice thing about good cleaning is it is an inspection at the same time. If there are any joints/seams that are not sealed then seal them. Water doesn't necessarily run downhill in an RV. Case in point, I searched high/low for the leak on our 'project' to finally discover that the previous owner appeared to have put a jack through the floor right behind the tires. Every time towed through the rain it would have flooded the floor. I was looking for leaking wall/roof.
3) Does everything work? On electric and Propane? Test and if not then figure it out. Yep, you can do it.
4) Back up plan for necessities? If it's chilly out, take an electric heater with just in case furnace doesn't work. Take a water bottle with in case you have plumbing issues
I'm nowhere near a guru but GOOGLE IS YOUR FRIEND. If you run across something, I can guarantee someone else has as well. Learn to search on Google and you can pretend to be a guru too. :)
I'm actually excited for you... Fun times!! LOL
Have fun!
