Steps required for getting custody

[starto2014]

Hi
My wife and I are from New Jersey.
We got to the US about 3 years ago with a kid from another country. Currently we have green cards.
While we were here we had another kid (she is a US citizen).
I want to divorce my wife and I was wondering what I am suppose to do in order to make sure she can't take the kids and go back to our home country.
I want to have joint custody (or even full custody if that is possible).

Thanks

 

[not2cleverRed]

Is your home country is a Hague Convention country?

 

[starto2014]

Is your home country is a Hague Convention country?

yes, it's a Hague Convention country