First off, have fun, it's a great float. As said earlier: rocky about the Dam. I'd put in below Piece of Cake, the rapid after Elk Creek. It's just a rocky mess with the "Fence" showing at this low level.
Camping, there's plenty of places to pull over or camp grounds you could just stop at. Deadman's Hole is a great spot to fish, as are most of the big pools both before and after the East Fork. There's more private land as you get closer to Challis, so be mindful.
The fishing will be better as you get further down, it's cold so most of the Cutties are downstream in the bigger pools. The Bulls will be awesome. Get something that sinks and send it to the bottom of the big holes and get ready, they'll hit a fish pattern like a freight train.
Let us all know how the trip goes, go sooner rather than later as ice will be a HUGE issue in the next month.