my babydaddy dont do nothing for my son her dont give me money for him and he post to get him every weekend and he dont what do i do

Assuming you are not married to the child's father, you need to establish paternity. You can do that by both you and the father signing a voluntary acknowledgment of paternity on the state provided form, or file a formal paternity action in court. Once DNA testing is completed and he is legally established as being the biological father of your son, the court will set a child support order so that you receive appropriate support for your son. If he isn't working, they can also order him to find employment and will adjourn the court hearing to set a child support order once he finds employment. The court can also impute income to him if he is capable of working but chooses not to, also for purposes of establishing a child support order.