Not sure how to do this

So I'm leaving. Might be close to a year later than the original plan, but better late than never. And apparently, the universe had just a few more words to say, things to teach me, before I was really ready for good. Perhaps this extra year was necessary to break every last bond? This is past year has been worse in some ways for "us" than even the most volatile, physically abusive years could be. I think it's because for the past two years I've been looking deep within, spending so much time on this board and ootf, writing, and getting actual feedback from smart people who counteract the crazy and quash the doubts that come creeping in. I've taken a hard look at my foo and the dysfunction, chaos, abuse, and mental illness that was my formative years, then took a hard look at my own kids and realizing I won't let him take them, so leaving is okay. Boundary setting, refusal to let him bait me, my refusal to JADE with him, well..he's not handling it so well. Hence the difficult year we've had. Or perhaps he hasn't changed at all. Maybe it's me, who once I saw behind the mask, once I was able to glimpse the truth among his lies, could never UNSEE or UNKNOW what I had been given. Either way I'm out. 
Tonight I'm hurting , but mostly that's my pride howling. This was the final injustice, the proverbial straw that broke the camels back. I'm ashamed that I chose to accept the lies he told over the body wash and the flowers, while my brain was screeching at me to just open my damn eyes. But I didn't. I beat that stupid brain back into submission for trying to make me see or do something before I thought I was ready. I have fought the revulsion when I look at him, or he opens his mouth, managing (just barely) to keep from vomiting his vitriol and my hatred of him all over his stupid, disgusting self. 
Problem is, I just don't know how to do this. The old me just wants to quietly disappear, and live to fight another day...without him...FAR away from him. But this other me wants to document everything and bury his a$$ under a mountain of financial and legal b.s. I want him to somehow pay for the years of sheer torture he has put me and my precious babies through, years in can never get back. I know the real me will probably create some hybrid concept of these two. I don't really want his damn money, I just want him out of my life, out of my kids lives, where he can never harm us again. Alas, I have this nagging suspicion that it doesn't really matter what I want, in the end he's going to fight me so hard I've got to be prepared. he doesn't believe he can lose, he believes himself smarter and superior in all ways to me, and most mortals. He believes he is RIGHT, that's the bottom line. For too long I was afraid he was. Now I know better.