need some advice on a legal matter

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Ok so I am a single mother and was never married to my son's father. Well I filed for child support because he wasn't wanting to help me and I feel that its not my sole responsibilty to support my son. Well it has taken the child support system months to track him down as it turns out he entered false info on the paternity papers like a false social security number, address and even name. Yep what he said was his name isn't his real name. Then I learn he has a bunch of false names, false addresses. I also discovered that his wife isn't dead but indeed still alive and living in his town and they have children. Well he brought a gun into my home a few weeks ago and told me he would kill me if he saw me with another guy. Then he makes threats to me and my family and tells me if I attempt to get child support he and his lawyer will take me to court and get custody of my son out of spite. Well after seeking help at a womens shelter I was urged to file a PFA which I have. I also received papers from child support services that they finally tracked him down. However I am scared to death about the whole custody thing. Both the judge and lawyer doing my PFA case told me to not back down. Any advice on what to do next. I want sole custody of my son. I can't afford a lawyer because I just finally got a car and a chance to go back to work. Any advice?