That is a great route and you will meet lots of other touring riders along the way. Once in Oregon I never camped alone. I wound up hanging out the same folks much of the way.
No worries about bears, but definitely keep food and toiletries in the provided boxes or the raccoons will drive you nuts stealing your food.
Don't take a huge tent, your bike will be fine outside. Do take a light cable lock. There were a couple urban places where I did not feel it was prudent to leave my bike unattended, but those were rare instance.
There is no reason not to take this trip as a first tour.
Have a great time!