Your local library should have a lot of books on ADHD. Hallowell did "Driven to Distraction", and "Delivered from Distraction", and they might interest you. For discipline, the Love and Logic books work very well for children with ADHD. Also, if he has outbursts, you may want to read The "Explosive Child" by Greene. "Dreamers, Discovers, and Dynamos: How to help the Child...." by Palladino was the first I read dealing with my son and I went, "Oh, that's why he thinks that way."
I would also look into Omega 3 fish oil supplements. Maybe your doc can give you a good idea of the right amount for him. The Omega 3s seem to help children with ADHD function better. There is also research that the red and yellow food dyes also cause increased hyper activity in children with adhd, so I try to keep away from as many dyes as I can.
When he is older, you may look into Cognitive Behavior Therapy. That worked well for my son. Also, many children with ADHD have problems with social skills, so a social skills group is useful.
Understand that adhd is not all bad, and that sometimes amazing abilities go along with it. Many children who are gifted exhibit very similiar "symptoms" as children with ADHD, and some people believe there is a link between creativity and adhd. It is all in finding what learning and disciplining style works best for your child.