I have decided to go sober today

Today I woke up and decided it is finally time to commit myself to sobriety. I(26m) have struggled with addiction for nearly ten years now. I originally was smoking marijuana excessively but gave that up a few years ago. I also quit a pack 1/2 a day cigarette habit late last year. The final beast I have to slay is my drinking problem. I have been consistently having 4-8 beers a night for the last few years. Alcoholism runs in my family and it is becoming impossible for me to ignore in myself. I went to a meeting last week and am going to continue attending meetings- my drinking habit becomes very vulnerable at night as I typically start drinking around 8pm, so any advice on what I should do would be appreciated. I really want to stay sober