Bills during separation

I am currently a SAHM to my 2 kids which means I do not make any of my own income. I have a credit card in my name but other than that my (ex)husband’s name is on everything. I do not even own my own car. Things between us have gotten really bad and I think I want a separation/divorce. I have family that is willing to let us live with them and get through things for a while. My cell, insurance, literally everything my (ex)husband pays for. How do things like that work during a separation? Should he still continue to pay for it since I am/was a SAHM? Never gone through anything like this before and want to have as much in control that I can before our world gets turned upside down.