Welcome to the forum.
Its a GREAT idea to practice backing up for a bit before you head out on the maiden voyage with your new trailer. Whenever we switched to a new trailer (shorter or longer) we always practiced in a parking lot - just like with the very first trailer we had - an old Jayco pup.
Besides backing up, the following can help you if you are new to RVing.
Pay attention to the turning radius and practice tight maneuvers that you will find at certain gas stations and in smaller campground sites. Watch the tailswing and make sure to learn how the trailer's rear moves when making tight slow turns moving forward and in reverse.
The views from your side mirrors will take some getting used to. Even if you get a camera, learn to use your mirrors.
Pay attention to the height of your TT. Good to look for low hanging branches and buildings.
As for cameras, here is one recent thread for you The Camper Cam Project.