Congratulations!!
When I bought mine, I took it to my mechanic and had him do a full check of things. One thing he found is that even though the rear brakes had just been done, the person had failed to put fluid in them... Worth it just for that. He was able to prioritize things for me - safety issues first, then the rest. There were some things I could do myself (clearance lights, etc.).
Tires - check and expect to replace.
For that age, have them do a check of the fuel system including hoses. My hoses had thousands of pinholes throughout - replaced 15 feet. Safer to get fuel issues worked out BEFORE you start taking it out.
House-wise, have the propane lines checked. It's another easy check that can save lives.
Caulking first thing is a good idea. Not that difficult to do but will save a lot of headache in the end.
Make sure the battery and charger/converter are working properly. May have to replace the battery in the near future.
The rest of the house can be dealt with as needed later on. Deal with safety issues first, then amenities. The aplliances are nice, but you can work around them until you can afford to fix/replace them. Get a soft-sided cooler and stick it in a cupboard - if the fridge goes out, you can always pick up ice. Stove goes out, you can cook on the fire. And so on.
Safety first. Chassis second. House third. Inexpensive repairs fit in as possible (like caulking).
Enjoy!