Who does most of the childcare? Courts support parents sharing care however a common pattern is every other weekend and midweek visit. 50% of holidays and alternative Christmas.
It is very common for abusive men to fight for residency as they know it's important to the mother and it also has the side affect of reducing financial support.
Getting access to finance info is probadly the most important challenge you will have. Does he store info at home for pension, mortgage & pension?
The divorce process starts by one party applying for a divorce, costs are circa £550, if under 2 years, it will need to be under unreasonable behaviour grounds. This makes no difference to the financial or childcare arrangements. First stage is nisi. To get the Absolute you will need to agree childcare arrangements and finances.
An amicable couple might be able to work this out between themselves (after both seeing a solicitor initially) and then get the information submitted to court for approval.
A couple who are both reasonable but may have areas of contention could use mediation as a way to get agreement as the sessions are facilitated by a 3rd party.
However if you are dealing with a controlling person, they are usually not reasonable and the divorce will be high conflict. If this is the situation you start with seeing a solicitor, followed by mediation sessions and if this fails you have to apply to court to get agreement.
I under estimated Ex and assumed he would be reasonable so went to mediation but since I was divorcing because he was abusive that was naive! You have to go to mediation however prior to court.
Had I known he would have been so vindictive and vicious I would have selected a different solicitor (one who knew high conflict individuals) and kept my cards very close to my chest.
He can't stop YOU moving out but he could decide he is the main carer and make an application to court for residency. If that happens then CAFCASS are appointed to assess the wishes of the children and make a recommendation to court.
First step is see a solicitor just to help shape your thpughts a strategy. Get a solicitor who will fight your corner, someone said on here.."a solicitor who you wouldn't want to have an argument with", very good advice as my solicitor was just lovely and couldn't handle Ex's hostility.
If he is controlling he is unlikely to be reasonable therefore the journey to divorce will be longer however you can get there. Many if us have gone through it and are happier as a result so it is definitely worth it.