Spinal OA is perhaps the worst because in a few people the osteophytes growing from the edges of the joints of the spine squeeze the nerves and cause pain and weakness in the arms or legs. Surgery may be needed to ream out the bone to relieve the pressure on the nerves. In the interviews conducted with people with arthritis, virtually everyone said that the main thing they wanted to convey is that exercise is truly helpful, especially swimming. I therefore heartily recommend that you hook up with an exercise trainer at a YMCA or health club to plan a program for you. You don't necessarily have to be a member of a health club to hire a trainer, however.
Many trainers work independently for a fee.
Ask at the health club or YMCA for names. If you have access to a pool, use it, because the water's buoyancy protects your joints from impact injury. If you don't have access to a pool, use the equipment found in professional gyms such as exercise cycles and Stairmasters. Walking is great, but in my view it's a distant third to these other two forms of exercise. Therapeutic exercises for specific joints such as your fingers should be done under the guidance of your doctor and physical therapist at a clinic or hospital.