Do a lot of research, looking and learning.
Plan to attend a RV show, see lots of options.
Once you get close to deciding on a model/manufacture, come back here for opinions. Keep in mind, if you dig far enough, there are nightmare stories, with almost all brands, as well as satisfied customers.
Make sure you have enough tow vehicle.
Get to know your local dealers, many times a RV will need warranty work, and a good dealer may make or break your satisfaction of first RV ownership.
Research, how you plan on storing your RV. (where, costs, covered, etc....)
If by chance, you know someone with an RV, go camping with them, learn the systems, how they work, etc...Also at campgrounds, many RV's will share knowledge.
Get out and make adventures!
Markiemark:C
