My daughter was diagnosed 4 years ago. We had her in therapy, and learned alot from her doctor on dealing with her better. Both my husband and I attended classes to help. Alot of hands on training, it is something that you will be in the long hall for.
A child with ADHD will have a hard time making friends as they are impulsive, off task and very un organized, they drive people (their peers crazy) she is 10 now and really struggles in having friends, which as girls ourselves you know you got to have girl friends. Most of her friends are boys and they are not the right choice always. We did choose not to put her on medicine, however we did find a natural alternative Native remedies has herbal remedies that have seemed to help. (it just depends on your kid too)
There are so many books out there. Hit the library first for the basics, try a child physcologist,they will have bio-feed back therapy helps too.
Good luck to ya, try and read the book by James Dobson the "new strongwilled child" it's a good one and he has good reading on ADHD.
Cheers