What rights do I have as the birth father in an adoption?

New Orleans Child Welfare Division served me with notice that they want to cut off my parental rights to my son and adopt him out to his foster family. He went into foster care when I got jailtime for a felony assault charge. I’m out now and I want to reestablish my relationship with him. Child welfare says I’ve been away from him too long and he’s attached to the foster family. I want to object to this adoption and get back into my son’s life. What rights do I have in this adoption process and do I need a lawyer to represent me? I only have a certain amount of time to respond to this paperwork so I need to find a lawyer quickly.