What do I need to do to get my child support increased?

My kids’ father has gotten remarried to a woman who earns a lot of money. He has barely paid me any child support in the 3 years we’ve been separated. Now he drives a nice car and they go

Does the child have to live with me before I adopt her?

I am from Turkey and I went back there recently and saw an orphanage. I fell in love with a young girl who lost her parents in the Syrian war. I want to adopt her but I need to get her here to Houston