I'm a big fan of DeLorme Street Atlas for mapping out routes, figuring daily drive miles and stop points. Along with DeLorme I like wecamphere.com for a fairly complete listing of campgrounds (they are still building a database of reviews, so also use rvparkreviews.com for help in picking a campground), then Google Earth to get a visual of selected campgrounds. This has worked well for the last two years and 25,000 miles. Also use Accuweather and plug in cities along the way to track anticipated weather conditions. Last (or first) is a plethora of books/web sites of the places to see along the way. And I ALWAYS leave a minimum of 30% extra time for unanticipated side trips!
Of course I probably spend more time planning trips than I need to (DW would certainly agree with that).
This is a beautiful county - enjoy your travels!
Greg and Karen, the pups Bailey and Lily (St. Bernard mix and Beagle mix) and Lola (the attack cat)