One of the first things I did very early on in my addiction treatment was understand the nature of addiction and what kinds of treatments there was.

I chose rehab with a detox facility.

This link will have a lot of answers for you. The National Institute on Drug Abuse (NIDA): Principles of Drug Addiction Treatment.

I wish you much success in choosing to live life free from active addiction. living drug/alcohol free was the best move I ever made.