TW: abusive relationship, talking about suicide, graphic words

I need to leave. I have a one year old son with him, I need to be able to prove he is abusive without a doubt because I can’t stand to think of the idea that he’ll be in the care of him ever. He threatens to kill my dog if I leave, that hell “blow his brains out” before I even walk out the door and has kept me from having friends, family or even my own vehicle access. I have no physical proof because I’m scared of being caught recording him, and he doesn’t physically touch or hurt me except when he elbows me to get off his gun case and I have photos of the bruises but none of my face with the bruises on my leg because I don’t have a mirror big enough and didn’t know I would need my face in the photo for court. I have proof of him destroying property and witnesses, but im still so scared because the safe house I have is out of state and until the court order says I have full custody I don’t know if legally I can move. I’ve called the police once before on him for threatening to shoot our landlord but the police didn’t even show up. I don’t know how to move forward. I’m well aware I need to leave so commenting “just leave” is useless, im trying. I need advice on anyone in the state of PA being granted full custody with an emotionally, financially, and verbally abusive partner but such little proof that I just have a notes app with dates of what he says/ breaks/ what happens and photos of a broken window, a hole in the wall and a broken door

I don’t know how to get proof of him screaming at me without him seeing it, and I don’t know how to get all of my stuff/ animals out of the house without him realizing because he comes home from work for lunch and only lives 2 minutes from his job. I just need help. Desperately. My son means too much to me.