I am going to suggest several things to do to hopefully prepare you for your adventures.
These are different things that you can do previously to getting behind the wheel.
Look online for a commercial drivers manual? This will give you a idea how large vehicles work besides your normal one you have driven before. It should give you a idea how when being passed by a truck, it may affect your vehicle.
Then I would suggest visiting a campground to see how other people handle there experience of pulling into a campground. Then how they maneuver there outfit in a campground.
While you are there, walk around during the morning and mid afternoon. While walking around, watch how people pull or back into there sites.
Then watch how they connect up to there utilities.
Another thing to do as you can, is visiting a Truck stop.. Just park possibly where you can watch RV,s pull in for fueling. How they maneuver there vehicle around the area.
While at a truck stop, look for where RV,s are parking for the night. Most truck stops have a place to visit the dump station. You need to figure that out also.
We all started our first time. Most of us have done more than one mistake in our adventures.
Hopefully this will help you some. Vern