Child support questions

So my next court date is on the 26 of March the judge will sign the mediation agreement between me and my ex regarding our 7 week old daughter. My ex is not on the birth certificate because he didn’t want to sign since he lost his temper and left. I have full/sole custody. Do I say something in court that day or do I need to file for child support separately? Also he admitted he was the father in front of the judge in court so will the judge mandate a court ordered dna test? How does this work anyone know? We were never married.