Child support

It’s being a year since we separated my ex husband and I, I have the kids and I pay rent and baby sitter cost -and groceries and I cloth them,I tell him to come see the kids and he won’t come I ways take them to him, I told him to help me with money and he only gave me $50 for the whole year he makes more that 2400 a month he doesn’t pay bills or rent since he lives with his mom, I have told him what I have been doing with the kids and he just ignores me, I told him if $200 weekly was ok and he said no, and now he’s mad that I decided to file for child support