You will probably get told to search, so definitely do that. I will share some basics, though.
If you let is sit for a month or more, you will need to charge the batteries. If you get trickle chargers for the main and chassis batteries, you can plug whenever it's parked and ignore. Check your battery water monthly, though.
Check tire pressure every time you are going to use it (very important for tire life) and make sure you know how to put on chains.
If you don't NEED your water running, then winterize your pipes and leave the water off. If your lines freeze, they can burst or fittings can bulge and leak. Water leaks are the bane of RV ownership! You can always take along a couple gallon jugs of water for toilet flushing.
If you will have shore power, take along electric heaters and cooking gear (hot water pot, coffee maker). If you will run on generator power, then be sure you have enough fuel. Mine pulls from my main tank and the suction hose runs dry at 1/4 tank.
That's a few good starter things to think about.
Jose