I don't know as there is much of anything in the way of advice I would be able to offer. However you mentioned your husband has been abusive. So I wondered if you are familiar with the National Domestic Abuse Hotline. That might be a place to get some solid advice at least regarding the abuse aspects of your marriage. Here's a link to the Hotline's website just in case you're not familiar with it:

Domestic Violence Support | The National Domestic Violence Hotline

I see you list yourself as being in Massachusetts. So I wondered, depending on where you're located in the state, if there might be a women's advocacy organization you might contact. Here's a link to the South Shore Resource and Advocacy Center's website. If they can't be of assistance themselves perhaps they may know of some other resources that would be beneficial. It would be helpful, I would think, if you could find some other women who have gone through what you're facing & can offer some specific advice:

http://www.ssrac.org/

From what you wrote, it sounds as though you have ample reason to want to leave this relationship. The important thing it seems to me is, as divine1966 wrote, to "get your ducks in a row first". My best wishes to you...