In my own experience the pediatrician gave us an 8 page questionaire to fill out, and also a list of psychiatrists who work with children in our area.  It took a while to get into the psychiatrist's schedule, but was worth the wait. It was helpful to go to the psychiatrists office with the "questionaire" already filled in, I think it saved us an extra visit, and valuable time.  Then after the diagnosis we started with "talking therapy" (The talking therapy gave us as parents different "tools" to use, as well as goals for  him ) and medication.  The medication was a bit trickier, but after starting, tapering off, and starting meds three times, we finally found one that is working well for him.  He is a different kid with the medication on board, or perhaps i should just say he is "His BEST self" with the medication.  Best of luck with getting the right diagnosis, a good psychiatrist, and the right medication (if you decide that medication is the right choice for your child)  My son was also about 6 when he was first diagnosed, and had some (but not all) of the same symptoms.  Good luck.