A 12 pack of beer?
I thought you were kidding, but, yes, that's pretty paltry for a lot of people around here. I met a guy recently with a big, bloated, fat, red face who drank over 90 beers a day for years. If you're motivated and of normal biochemistry, you should expect success with TSM, although it's not guaranteed. There's a book you could read "The Cure for Alcoholism" that would provide detailed information, but all you really need to know are the "Four Steps" of the Sinclair Method:
Step One: Take 50mg Naltrexone one hour before the first drink of the day, and never when you're not going to drink
Step Two: Wait an hour.
Step Three: Drink as you normally would (same drinks, same patterns)
Step Four: If you choose to continue to drink in the future, repeat steps one through three every time you drink for the rest of your life (or, "for the foreseeable future")Since you are so motivated, I would go ahead and order the book from Amazon (or download it to kindle) so you can learn the details of the science behind the method (this will help further your motivation).
Some people find "instant" success with TSM and never overdrink again, others find gradual success over the course of a few months. It's not a magic pill, so remember you have to provide some effort, some self-discipline for this to work most effectively. For some people, only minimal self-control is required (that's been my experience), for others, maximal self-control is required.
Keep posting while you go through with the first stages!
P.S. The fact that you drink beer is also promising, as it has the lowest alcohol content and is the most filling. If you're like a lot of people, you'll find it very, very difficult to drink 12 beers on Naltrexone (it will be akin to drinking 8 slurpees or eating 5 bags of skittles -- they taste good, but you reach a point where "enough is enough"). This is opposed to people who slam a pint of vodka within 5 minutes, which tends to override the Naltrexone.