Be sure to get the CC manuals for the Coach and Chassis.
I have found virtually everything is explained or diagrammed in the manuals. The electric and plumbing diagrams and schematics have proved invaluable.
Also valuable was our Cummins engine manual.
Accessory and appliance manuals can be found on the internet so are of less concern.
Focus on how to move the coach safely and get the leveling and slides set up when camped. You can learn the rest at your leisure. Air pressure for the travel height and air brakes, and preheating the diesel engine/generator before starting are probably the two most basic differences.
You might do a search and read the Air Brake Pre-Trip Test just to understand the function of the air pressure and the brake test. Pre-Trip Inspection | Brake Check | Commercial Driver's License
You are in for a treat with that new rig.