Above all, find a person that you are comfortable with. The psychotherapy relationship is a very personal one, one which requires trust and honesty. Take care and time in finding the right doctor or therapist to work with. It will pay off in the long run. You can get a referral to a competent, psychologist by contacting your local or state Psychological Association.
Most associations operate a statewide referral service, which can be found in the yellow pages.
Consider a support group. There are several support groups for Internet abuse and addiction. Unfortunately many of these groups are on-line chat rooms. However there may be good support and information in these groups. Other support groups for alcohol, drugs, or gambling may be useful as well .