Some really wise words here. @Ellierose1989 I totally understand your hopes, but tbh because you have debts and not savings behind you, honestly 200/month leftover is going to very quickly cause problems.
You need to pay off debts, have an emergency fund for income replacement, and another pot for the everyday emergencies that arise (boiler, car etc). If you had all that then you could probably swing it, but you don't.
Big question, when will additional debts be paid off?
Go back and give it a year and see where you are. Of the 600 left, put 75 into family fun, 75 into an account for school uniform, birthdays, Christmas (and really watch your definition of need vs. want - kids don't need lots of presents for holidays), 50 into a savings pot at home for incidentals and split the remaining 400 into a mix of savings and paying off debt. Do this for as long as needed to get a 3-6 month emergency fund and your debt paid off.
While you are doing this look at what options there are to work from home. Could you child-mind part time? Plenty of people are looking for someone 2-3 days/week. If you have it all set up, are registered etc., then you could look at giving up other job. You'd save on childcare too.
We don't need hoards of money, but the worst does happen and we need to be able to protect our families.
Good luck!