Go to a nearby short term stay campground a couple of days for a 'Shake Down ' cruise. Approach your neighbors for tips, study their set up. Pay attention to how and with what they level, hitch, unhitch, stabilize, dump, winterize, dewinterize, awning tricks, all the thousand ideas of a home on wheels.
Pick out what is right for you, all the while listing what you left behind, what you brought you do not need for the next trip.
My suggestion is lumber scraps for leveling and for under your jacks when the ground might be soft. and a skillet with a bit of water in it as your level. Water is always level in all directions. And you have a skillet, no need to bring along a level, right?
Forget lego blocks, sewer hose slinkys, or expensive toys until you have some experience. A good Watts water pressure regulator. Until you have one, just use your fresh water tank and pump. no worries of high pressure that way. Or of having no water after a freezing night.
Be careful when opening and closing slides, quit trying when you hear the slide motor labor the tiniest bit. Save the shear pin.
Extend your front landing jacks enough to let the nose back down when it is high unhooking, extend the drop legs enough that the jacks can raise it enough when front low unhooking. Do not over extend or bottom them out.
Welcome to the life!