I need advice

Me and my husband have decided to separate. But I have no clue where to start or what to do.... I'm so hurt and upset. Hes done some things that we just can't get past (like purchasing nudes from his ex right after I gave birth to our daughter) and he just isn't seeming to want to work on things. I have been a most stay at home mom with our daughter and jow I'm starting to work more but it's hard because childcare is just as expensive as what I make. How do you do it?