Numerous campgrounds exist, but are expensive in Canada. $20-24 per night was typical. Only one campground had bear boxes. I typically hung food each night. Yes, bears are prevalent, but never had a problem.
Climbs aren't steep, but are long on the Icefield Parkway. Bow Pass and Sunwapta Pass are the two most difficult. I typically carried three days of food in this section and glad I did.
Jasper was a tourist town with railway service. This may be an option for getting there.
Hope this helps. This is really a beautiful tour if you have good weather. Enjoy!