This is an absolute great web site that is packed full of information tailored for new RVers of all styles.
(ChanginGears.com, click here).
The "Getting Started" link in the left side menu list is an excellent starting point. It will give you lots of information you probably have not considered. It's fun, it's informative, it's exciting to learn. Going through just that one page and reading the pages associated with the links on that page will give you good direction.
I think the second most helpful topic on that web site is the menu item "Manufacturers". There it has an alphabetical list of (almost) every RV manufacturer available, sorted by make or brand. What's beautiful about this page are the links to the manufacturers web sites where you can drill down on each one and view floor plans and designs. Be warned though, you can spend a lifetime doing just by itself.
After you have identified what you think will work for you, what you are looking for, what you like, what you don't like, you'll have better ammunition to take to the first dealership you encounter.
The site covers everything you should consider, from the tires to the television antenna and everything in-between.
Another site that is a really fun site that has good information, but not as "loaded" as Changin'Gears, is
GoRVing.com. I've been around RV's, pretty much all my life, and I still absolutely love this site and watching the videos. It's basic information, and really a good starting point too.
Good luck and enjoy. And ... expect to be overwhelmed.