Welcome to the world of RVing! Sorry to hear about the dealer being less than helpful. They should had done a PDI to everything was OK but it doesn't sound like they put much effort into it, if at all. Most of us were given a walk-through where we are shown how to work the systems before taking our campers home.
This is a great site for information so between researching and asking questions you should be in good hands.
Great choice for "Living within my means" and camping for one...
2011 Salem Cruise Lite 20RBXL & 2011 Toyota Tundra Dbl Cab
Camping History: 45 Trips / 133 Nights / 3736 Miles
FRF Social Group: Campers of the West