First if all, well done.
You have done what many couldn't.
You have buckled down and made good on your wishes for a better life for you and your kids.
Find an attorney. And if your able confide in someone you trust to provide you with back up and support if things get hairy, do that too.

There is no good time to do this, but do you want to be where you are for another Christmas, or another New year?
Wishing you all the best. Really hope you find that strength, you have come so far I really believe you can do this.
Take care.