Stay strong, it is too easy to go back, and it doesn't get better if you do. I hate to speak from experience, but...
It sounds like you have things lined up well. Call a women's shelter when you are ready - they can direct you to many resources regarding legal stuff including names of lawyers etc. The more info you have, the easier it will be for you to not go back into that relationship. I remember my day of liberation, I told him I was no longer afraid of him. While shaking in my boots. When I had hung up, I realized I truly was no longer afraid. And I got on with life. That was almost 30 years ago.
Sounds like you have found your crack in the door. Go through, and never, ever look back.