My advice is to read, read, read. There are many full-timing posts on this forum and other sites such as iRV2 and Escapees.
I would not advise to set a one-year deadline for quitting. You may really like it as we did. We continued for 16 years and moved around constantly. It really is a wonderful carefree lifestyle and we've met so many permanent friends through the Escapee RV Club. We also use the club as our mail forwarding service with no problems.
We also volunteered for national and state parks and loved it. Getting to actually live in those beautiful places is really a great perk. Plus, we knew that we were really helping out at preserving those parks and letting others enjoy it.
We had no 'exit plan' as some folks think you need. We sold the house and everything in it and just took off. As it turned out we settled in an altogether different place than we would have ever dreamed. We have absolutely no regrets. Good luck to you!