Hi, going to a child psychiatrist is in fact better as, among medical practitioners, they tend to have the most training in ADHD. But do ask around among friends, neighbours and relatives for a referral. They may know someone from first hand experience. Going to the right doctor is important because a wrong one may result in a wrong diagnosis and thus wrong treatment which can be dangerous. In fact, some experts believe that, say, if a patient has bi polar but is diagnosed as having ADHD and thus given stimulant medication, the meds may make that patient manic, depressed and even suicidal.
But before going to see the doc, I suggest you read up on ADHD (such as its causes, symptoms, treatment available, adhd vitamins and diet, etc). Armed with these info, you will know what your options are and will be able to make informed decisions later on. You can get good info here:
http://www.adhdquestionsandanswers.com
Good luck. I wish your son the best of health. Don't worry too much, because most ADHD people are very intelligent and creative and I wouldn't be surprised if your son is like that also.