Filing for child support

A little background. I was in a very mentally, emotionally, physically and sexually abusive relationship. I ended up getting pregnant and the altercations we had because of that was the final straw for me to leave him. So now I am a single mom and I am unsure if I should file for child support/custody or just leave it alone and let him live his life. In all honesty from all the abuse I am scared that he will end up hurting my child if he got visitation or anything. I am going to talk to a lawyer about this but I wanted some other opinions so should I file or just leave it be?