If the mother wants full custody, and the father wants a paternity test for purposes of child support, can this be used against him in a custody battle?

I have an 18 mo daughter and her dad, who lives in PA, has never seen her. (I left him and moved back to WY when I was pregnant b/c he was smoking pot all the time.) I filed for child support 1 year ago and he has been stalling by not returning paper work and he has yet to take his paternity test. It will come back positive when he does. In a recent email, he said he wants to sign over his rights- otherwise, he will want partial custody. He is in a new relationship and the woman he is with sent me an email a few months ago in which she said terrible things about my daughter and I. My daughter needs the support of her father, but I am uncomfortable with the idea of him getting partial custody. I am okay with him having visitation though. What are my rights? Is there a way to get at least minimum support if he signs over his rights? Is there a way to maintain full custody of my daughter? I am not married, she is not being adopted and her dad is not on the birth certificate.
The dad is Shoshoni and I am Northern Arapaho. My daughter is enrolled in my tribe. Will this help at all?
He is not employed, his gf supports him. But he does get a tribal per capita check every month. The courts have already established a monthy payment (minimum) and he owes backpay, but he is stalling on the paternity test and (as I said earlier) threatening to give up his paternal rights.
Also, he has a new son with his current girlfriend. As far as I know, they are not married. I don't know how/if this will affect anything.
I was researching and was wondering, What is a voluntary relinquishment affidavit? What are the requirments of signing one?
Thank you so much, I appreciate any insight on this extrememly complicated matter.

I have an 18 mo daughter and her dad, who lives in PA, has never seen her. (I left him and moved back to WY when I was pregnant b/c he was smoking pot all the time.) I filed for child support 1 year ago and he has been stalling by not returning paper work and he has yet to take his paternity test. It will come back positive when he does. In a recent email, he said he wants to sign over his rights- otherwise, he will want partial custody. He is in a new relationship and the woman he is with sent me an email a few months ago in which she said terrible things about my daughter and I. My daughter needs the support of her father, but I am uncomfortable with the idea of him getting partial custody. I am okay with him having visitation though. What are my rights? Is there a way to get at least minimum support if he signs over his rights? Is there a way to maintain full custody of my daughter? I am not married, she is not being adopted and her dad is not on the birth certificate.
The dad is Shoshoni and I am Northern Arapaho. My daughter is enrolled in my tribe. Will this help at all?
He is not employed, his gf supports him. But he does get a tribal per capita check every month. The courts have already established a monthy payment (minimum) and he owes backpay, but he is stalling on the paternity test and (as I said earlier) threatening to give up his paternal rights.
Also, he has a new son with his current girlfriend. As far as I know, they are not married. I don't know how/if this will affect anything.
I was researching and was wondering, What is a voluntary relinquishment affidavit? What are the requirments of signing one?
Thank you so much, I appreciate any insight into this extrememly complicated matter.

I recently had a paternity test taken for my son, we dont know the results, but I would like to know if I can still go through child enforcement to do a legal test ? I want full custody because the father was not in the picture at all and now he wants to have rights, and I do not want him to try to take a baby he hasnt even seen. I am the only one on the birth certificate and I am a great parent. what should I do to get full custody besides a lawyer?