Talk about the changes and expectations of parenting. If your place of work allows it, take paternity leave. Get to know your new baby and let your baby get to know you. Remember, with time you ll gain confidence. Parenting classes will prepare you in some ways, but no one can duplicate reality.
Experience is the key here.
Spend some time alone with your baby. Fathers need to bond with their newborns just like moms. This is also the perfect time for your wife to spend some time by herself. Seek support and guidance from experienced dads. Have a reunion with couples from your childbirth class.