Here's a great resource to answer a lot of your questions as well as provide info about things you didn't know to ask go to
www.rv-dreams.com and read through the blog and forum posts.
There are RV driving schools that will help you get comfortable with towing or driving a large vehicle like a Class A.
Rent before you buy to make sure RV'ing works for you. Take a weekend trip and then a couple of longer trips. A two week trip where you move from destination to destination every couple of days will give you a good picture of how much work is involved.
