Please don't take this the wrong way Rupert. I was with you right up till the last sentence in your post when it became apparent that your plan to quit drinking is simply to quit drinking. Given the sort of drinking you describe your going to need a better plan than that.
I hear you about feeling lost. I think that a good plan would be to find yourself at an AA meeting. Here's a link.
Alcoholics Anonymous : A.A. Near You
I suggest you make the call. Now