getting child support

hey ladies, my baby’s father was not present at the hospital when she was born a few weeks ago. he was treating me terribly and so I just did not put him on the birth certificate. which I now realize was stupid of me but I’m not even sure if I would have been able to put him on it with him not being there as I don’t know all of his information. but ANYWAYS, I need help and would like for him to buy her some things and spend time with her but he has messaged me and told me he’s not seeing her at all or buying her anything because he doesn’t think she’s his baby. he also said that he’s not going to buy her anything “that will go to my house” and he’s only going to buy her things for his house... so anyways, how would I go about getting him to pay child support and getting him to take a paternity test if he’s not on the birth certificate? what’s the first step I need to take, where do I need to go and what do I need to have him do? i know I need to either go to dfcs office or the health department, just not sure what the whole process is and would like to hear from someone else who has gone through this and their experience. thanks!!