How are you?
Keep strong, in mind and body and spirit... which means looking after your body, with sleep and food and staying hydrated (easy to forget at traumatic times), and keep those fears at bay of you possibly can.
You aren't fighting this battle alone now, and although this man seems all powerful to you, to others you meet along the way, he won't seem scary or wonderfully righteous.
But to fight this battle for you and your children, and to free you all from a life so very far from Gods will, you need to get equipped with information. You need to understand how the systems work, what to do to protect yourself now and in the future, what is evidence, the way to explain things so that it's easy for people to understand i.e. Not minimizing or down playing things, and knowing what is abuse & how severe it is etc.
You don't need to know it all this second, but you do need to talk to experts and really understand what they're saying. And don't believe things simply because your husband has told you something, or that's how you've been brought up. As you're discovering, there's a whole world out here which isn't ruled by your husband.