Hi Richard----personally, I LOVE maps. I know it's not "tech smart", with all the apps and google stuff available....
...but I love holding a real-honest--to-goodness map in my hot little hands.
If you aren't already a member, AAA and Good Sam both offer free trip-planning with maps and trip-tiks.
And really, any road atlas will help with the main arteries. You probably won't go too far afield on your actual journey, will you?
Once you arrive in the Saint John area, the NB map that you can get free at the Welcome Centre either at the border or just outside of Saint John proper. And you can go online to any state tourism office and also the provincial one for New Brunswick and they will mail to you a map plus camping and tourism info.
And I am checking into the campgrounds as we discussed.