From Rangely you'll be in farmland for about 15 miles before it enters canyon. There is a small rapid at Cowboy Canyon (class I, II on a good day). The rest of the run is glass.
Launch downstream of Rangely to avoid a possibly low/ narrow bridge and the view of peoples backyards.
Camping isn't a problem, lots of open areas. Cowboy Canyon has a nice camp, and Goblin Valley is popular. I think most of the lower run is BLM so you can camp wherever.
Once you pass the Gas Wells takeout, you're on the Reservation. You will need to obtain a permit from the Res to paddle, take out, etc. I've never paddled below Gas Wells for that reason. That and I don't like my truck being broken into.