Hi Andrew,
Try as you may there is no way to fully prepare for ALL that goes on with RV living, but your on the right track, starting before hitting the road. Gets your head into it so to speak.
We did our our shake down (living in RV full time) in the driveway for 1 month before selling all we own and hitting the road with truck and trailer in tow.
Going on our 4th month without major issues and tweaking things as we go.
Buying used was excellent choice. Horrible depretiation that 1st couple years. History of use will be best clue to condition and always ask why it was sold or traded in.
Good luck