A few things to note;
You will always forget something. There is a Walmart 5 minutes away no matter where you go.
Get a basic tool box, for now just take some stuff from home. You'll need a Robertson #2 square bit screwdriver.
Don't buy cheap water hoses or sewer hoses. Invest in quality. ZeroG, Rhino, Valterra
Make sure you have plenty of Propane.
If you can, camp in your driveway a few nights.
If you can, camp at a RV Park close to home for a few nights.
Beer, wine, booze
You don't need everything right now, figure it out as you go.