First of all welcome aboard!
Everyone that got into RVs was a newbie at some point. So most are more then willing help out. For the basics I'd hit up Google and search for terms like RV Basics, or RV 101 - anything that will give you the basic understanding and how to's. There is a lot to learn, but it's not hard once you understand how things work.
Also once you get one don't be afraid to ask for help. I can't count how many times I've seen a new owner dealing with hooking up hoses, waste water lines, awnings etc. But you know, somebody helped me out so I try to pay it back.
In the main Toy Hauler forum near the top is the Complete List of Toy Haulers, that will give you links to most the manufacturers and let you start window shopping. Don't rush things, don't let a sales guy try to buy now, take your time kick tires, ask questions and glean as much information as you can.
Figure out much space your toy needs, then if you want a garage or central cabin. Biggest groups are those owned by Thor & Forest River. There are a lot of choices, some will depend on your truck and how much you want to spend. It's hard to say which are middle of the road units, as each brand usually has a cross section of prices.