There is an excellent online resource for physiotherapy: www.bobandbrad.com

Bob and Brad have a YouTube video with a lot of different exercises that you can watch and work on to strengthen and rehab painful muscles and joints and to stay fit!

If you are less inclined to watching videos, two excellent books to teach you how to do exercises for your neck and back I would recommend are: Treat Your Own Back and Treat Your Own Neck by Robin McKenzie.