Do not go out and buy everything you think is neat for RV'ing.
Slowly buy undies, socks. lite and heavy jacket, shoes, boots, shirts, lite weight pots and pans, plastic coffee cups and dishes. Stock up on paper plates and holders. Plastic drinking cups, spoons, forks, and knifes, and Wal-Mart silverware. Put all these things in the trailer and leave them there. Loading and un-loading all your stuff every time is a PITA. In other words, be already to go camping except for food. Get good drain hoses, at least 2 and a clear plastic fitting for the sewer dump. Always have a seperate hose for the black tank flusher. Buy more than one fresh water hose....2 will normally be enough. Get a good water pressure regulator with a gauge. You need to see when all the holding tank water is running clean. Always run lots of water when using the toilet. Normally it will take at least 3-4 flushings of the "black water" tank to get it clean.. Buy a few totes to keep your fresh water hoses in and if needed one for the "stinky slinky" and fittings. Buy a Volterra gate valve and install it on the sewer dump end. Don't ask why...just do it. This will be a good start to go camping.
Write this down and do not forget:
Never...ever...turn on the black tank flush and walk away. Please don't ask.
You and DW set a plan for setting up and packing up. DO NOT get distracted while doing either. Sometimes bad things happen if you do. Like power cord left at CG...$150. Pressure regulator left on water pipe (don't ask)...$100. Left without the dog or kids (that could be a good thing). Dog still hooked on truck bumper. You get the picture. You think I'm kidding. Go sit at a CG and watch people leaving and see what is dragging behind their trailer and trucks.
Buy some "pony tail" rubber ties. Use them to hold opposing cupboard doors closed. Load all heavy stuff in the bottom drawers. Remove the glass plate from the microwave and store it somewhere safe. That plate costs more that a new microwave. We had this happen...broke the plate and glass on the door on our 1/2 time/microwave. Got real expensive.
The reason I am stating these things is.....you bought what is known as a "rolling earthquake". So load it properly and you should not have any problems. We have all been there..done that.
SO, you thought you bought a camper....you just bought a small home that needs STUFF. LOL
Good luck and have fun.