you haven't been married very long, so there can't be a lot of joint assets to disburse, retirement accounts, property......the legal part of the divorce "should" be fairly straight forward. it might even be possible to get an annulment. however, you WILL need legal counsel - most attorneys offer a free intro consult.
his drinking is established and existed long before you came along. you are not obligated to GET him sober, nor is there any truth to his lie that he can't do without you. that hasn't panned out so far.
he was living somewhere before you met. that was only a year and a half ago. he is far more capable than he is trying to force you to believe.