CHILD SUPPORT in GA

I have a two and a half year old son that I am trying to support off of a minimum wage job. His father had a good paying job when our son was first born but lost it due to stupidity. Anyways it has been 2 years since he last helped. He does things every now and then but this is if I help him out or when he feels like doing something, as he says. I dont appreciate having to help him to help our son especially since that defeats the whole purpose of providing your end of the bargain. I dont know if I should put him on child support because not only does he not have a job, and I doubt he plans on getting one any time soon, but he also has another child that he has to pay child support for. If I put him on, he wont have the money to pay it, and then I feel I have wasted my time and effort trying to bring this to justice when I end up doing the same amount of work anyways. Should I do it and if so what could I do to enforce him to pay, or should I just come to the realization that I probably will never get any help. Help is always great but I dont want to waste my time if it wont do any good.