Jane, I would suggest that you rent an RV (probably a class C) from one of the various RV rental companies and take it to a close by RV park. This will give you the opportunity to learn about the basics of hooking up to the water, sewage, and electricity...and the other stuff involved. This would also give you the opportunity to research the various brands of 5th wheels. You can walk around the park and ask your fellow campers those great questions and be able to ask lots of follow up questions about their campers. I'm sure they would be very helpful in sharing information.
Dumoldles