What to do

So I’m honestly planning on leaving my boyfriend. I have two daughters one is from him she’s two months and I’m just over everything. He’s childish he has no patience he spanks my three year old that isn’t his he yells at her and even yells at my two month old because she cries a lot like wtf she’s a baby!! He would text women while I was pregnant and watch videos of random girls twerking. Random local girls. He has told me before if I leave he will take me to court even his mom said so I wanna know if I save screenshots from texts should it have his name or number on them. Because I just have his name saved as his regular name. Also anything else I should do?? He smokes weed everyday I don’t feel like my daughter would be safe with him he would just leave her with his mom if he got custody. Also him and one of his sisters tried to fight me while I was pregnant I had bruises on me and I have pictures of them. I haven’t left because I thought we could work things out and I also have no where to go. I’m trying to get a job and save money before I leave for good. I have no car either.. I just need to get a car first and save some money and then I will leave. I’m in tx btw.