It seems that you don't want to pay child support. Your ex will fight you tooth and nail. Please speak to an attorney asap.

Filing for enforcement of an out of state visitation and custody order?

You need to speak to an attorney in Pennsylvania.

You can move, you just can't take your kid with you without a court order.

Can she be held in contempt of court?

Its hard to know what is going on, based on the information provided. Please speak to your attorney.

How can I get legal custody of my 4 year old son ?

You will need to file a petition in Family Court, but you will need to serve him, and that will be tricky, since you have no idea where he is....

My x husband shot me in front of my kids,we have an order of protection on me and my 3 kids. The order includes a third party

Contact the police and contact the DA. Protect yourself. This is someone who shot at you.

What rights do he have as the legal father?. Can you bring her before the family court even though he is undocumented?

If he is the legal father then he is the legal father, notwithstanding anyone's immigration status.

What do i do

You cannot be evicted by your BF. Speak to an attorney asap, and you may need to file for custody and support. Please do this asap.

You can make an application with the court for the relief that you are seeking. Please consult counsel.

Can I get sole custody of my child until she's enough to decided weather she wants him in her life?

No. Children do not get to decide. Court's decide or the parents if they have an agreement can decide.