Like others said, make sure they show you how to set-up and take down everything. Including water (don't turn on water heater unless full), heat/AC (has a time delay switch so may not start for couple minutes if you switch off/on), awning (including how to secure it when towing, a non-RV friend rented and ripped his awning up), how to level, etc. they probably have a checklist for you. May sound like a lot, but if you go slow the first couple times you'll find it's pretty simple.
You already have the toughest part behind you (bring comfortable with a big 8ft wide thing behind you on the road). Have a good time, and don't be concerned about doing things slowly (pulling in for gas etc) so that YOU are comfortable - it won't kill someone to have to wait a minute or two for you. Also, don't be shy about talking to other RVers and asking for help etc, most are very friendly and eager to be of assistance.
