First thing to ask any solicitor: have you dealt with an abuser before. You need someone with experience. Your H will not make any solicitors life easy.
Then it's about where they suggest you live, separately to him, preferably in your current home with the children, and how you manage financially while it all gets untangled. I hate to tell you this, but it could be more than a year.
I managed to find a solicitor who knew I had nothing, and took the fees from my final settlement, it made him v keen I got the best possible outcome. He was also a barrister, which made things a little cheaper when it came to court, so that may be worth a look too.
I know YOU want to be amicable but there is very little chance he will. Prepare for a fight, not to stitch him up, that's the last thing I wanted either, but to get what is fairly yours, so you can live a life, and you don't get to decide that, the law already has.
Also, the law doesn't care who did what to whom. Not about you being a rubbish wife (sure you are not, but The Script says you are) or him and his issues. It's just about a fair settling of affairs for all.