How do I go about getting sole custody?

[Eric Brant]

My Ex-Girlfriend did not inform me about where she was in the hospital to see my son or sign the birth certificate. When she finally messaged me on Facebook she told me to get out of her life. We went on talking back and forth and I told her I was going to get a DNA test and she agreed to it. Then I had asked her if she put me down as the father and she had said no. Then I told not to worry about the DNA test because since I am not on the Birth Certificate I am not responsible for the child. Then later on I started thinking about the decision that I made. Today I had contacted her if she was free this saturday so I can schedule an appointment for a DNA test. She had read my message but did not reply and disregarded it since the message notified me that she had seen the message. So I had sent another message 20min later. Still nothing. I finally sent one last message saying "I would like to know if you're free on Saturday so I can schedule a Paternity Test. I am not going to schedule one and let you know where and what time and you not show up because I'll be wasting my money. So are you free this Saturday and can you send me some pictures and do not blow me off" She had finally responded and told me this, "Leave me alone please. Keep messaging me, and I will go to court for a protective order for harassment. I asked you many times to leave me alone". During her labor which I had to find out via a second facebook I asked her why did she not inform me and kept me out of everything and she told me this "Why are you fucking with my life??? You just caused me to lose EVERYTHING. Thank you leave me alone!!" She is a crazy psychotic two faced bitch and she's nice when she wants to be and get's mad out of nowhere and always changes her mind. So I would like to know how do I go about getting custody of my son? I would like sole custody because she has another son who she has not seen in about a year or so and his father isn't apart of his life. I would like my son to have his father even though she will not agree to a DNA test now. Also her friend is a mind manipulator. Her friend belittles my character and say's things about me that is not true. Her friend says things like " I am a woman beater, I am going to be in and out of my son's life and that I do not have any rights, which is totally ridiculous."
If you read correctly, my ex will not let me have anything to do with my son. I do not have my son at this moment and I did not get to even hold him
How do I go about getting sole custody or dual custody. My son is only 2 days old btw