Have you any evidence yet of his domestic abuse?
www.gov.uk/legal-aid/domestic-abuse-or-violence
Have you done the Freedom Programme course? I strongly recommend it. wWw.freedomprogramme.co.uk
It will help you understand what he's done and doing so you can heal and protect yourself. It also explains how your children will have been affected so you can support them. Might make you feel less alone.
Rights of Women have useful info on their website about occupation orders and non molestation orders among other things.
Have you talked to Women's Aid?
Looking into therapy? Made the children's school/nursery aware so they can provide support?
You need to start the process of learning to trust yourself and no longer taking things he says as gospel (or even truthful or factual).
For instance him telling you you wouldn't cope without him etc or what he told you about CB.
Money Advice website and CAB website are both useful for informing yourself on how lots of practical things are done (e.g. Council tax). Which is helpful if he's stopped you from being involved with certain things so you don't know how to begin. Also, if your council is like mine their website is probably full of useful information.
I'm pointing you at the websites where you can have a look yourself because I think finding the info yourself and then knowing where you have reliable sources to look up other things will increase your confidence and make you feel more in control, which is really important for your recovery from his abuse. Make yourself a list of useful sources of info and organisations you can turn to.
Depending on how controlling he was and how much it's dented your confidence, would it help to make a list of things around the home you know or what to do in an emergency? So are you happy with turning the water and electrics off and knowing which kinds of water leaks are an emergency and which aren't? Do you have a number for emergency plumber, boiler service etc? Home insurance details? Do you have oversight of the contracts and bills?h
Is your income going into an individual bank account or joint?
It's great you're managing so well at the moment. If you have down periods or hit a blip in the weeks and months to come please don't be too hard on yourself. There is a lot to process and adjust to so there might be times you feel down or worn out or miss him (or the person you thought he was/the life you dreamed you'd have with him).
You might also find there are painful experiences from the past that you couldn't really deal with at the time because you had your head down trying to survive that will suddenly rise up and blindside you with all the emotions from back then. That's natural and positive, because it means your brain has finally been able to start the healing process, but it can still be tough (esp if you didn't know it might happen!). Selfcare and compassion will be your friends.
Good luck and take care. 