Yep, Margypops is right! We have a pretty good site dedicated to ADHD. You can find it here -
http://www.medhelp.org/forums/ADD---ADHD/show/175
Of course, I am a bit biased being the CL also for that site. But I think I can help. Please start a separate post over there. Maybe if you can include some of the things that make you think he has ADHD that will save some of my questions. Also is he in school and how is he doing there?
I have many resources I can link you to - but be aware that there are other things that can cause ADHD like symptoms, so this is not a simple thing to do. But its important to find out what is going on with the little guy - so I will look forward to hearing from you!