Deep breath, mama. It can be a big scary leap into the unknown, but you can do it.
I don't know your back story, but if you ask just about anyone here who has left a partner with a nasty temper, they'll tell you that life on the other side is so much better. No more walking on eggshells, no more being worried about explosions. It's great.
The exact ways that it'll play out will depend on a lot of factors. Take stock of your assets. Do you have family or friends you can stay with while you get on your feet? Based on his salary, look up child support laws in your state and get an estimate of how much he would be ordered to pay. Are you eligible for any public assistance, like TANF or WIC or food stamps or housing assistance? Do you and your husband have any joint assets?
Some women do manage to be single SAHMs, through a combination of child support, public assistance and working from home. But typically it means working. Do you have any job skills? Any education? For SAHMs without a lot of job experience, one thing to consider is doing in-home day care or getting a job at a daycare where you can bring your LOs.
Good luck, mama, and keep us posted.