Beside filing the notarized Affidavit of Parentage with the Michigan Department of Health Services Central Paternity Registry Division for Vital Records and Health Statistics, the parents should try to agree on issues of child support, parenting time ("visitation") and custody. If the parents cannot agree, then they must get a court order.
In Eaton County, child custody and visitation issues are decided before the paternity order is entered. Other counties may handle the timing of custody and visitation orders differently. Check with your county's Prosecuting Attorney!