My experience with Rv-ing is limited, but through a little web research, I would think that you might be able to answer all those questions you have. Hopefully some of these will help.
First place i would start is here: http://rvbasics.com/
This looks like a pretty good site to start talking about maintenance, checklists, costs, what to expect, etc.
As for price ranges for camping sites: http://www.trailerlifedirectory.com/
This is a great place to estimate mileage, camping amenities, seasonal rates, etc.
This site might be helpful as well for 'general' information: http://www.your-rv-lifestyle.com/
There are dozens of RV-ing magazines that are also available as well as books, but in my opinion, I think the best way to get the advise you want is to talk to the people who are doing it. Maybe plan a couple of camping trips during the summer when the camping hosts are onsite. Then become a 'good neighbor' and see if you can talk shop with them about what they know and what they do. They are typically busy during the weekends when everyone is checking in and out, so you might consider going during the week when things slow down a bit.
My wife and I have met a couple that comes to Granby Colorado every year and in one evening, we were able to talk to them a little about how and when they decided to make a lifestyle out of hosting campsites. We have since continued to visit them a few times a year and make it a point to keep in touch while they're camping in the warmer states during the winter.
I hope that this will give you a start on where to find some information and I think that after reading some more forums, magazines, websites, and talking to full timers, you will have a pretty good idea as to what you'll be getting into. As anyone might say, sometimes just jumping into it with both feet is half the fun of it. Think of it as 'on the 'job' training'
Take care and good luck!