I am a teenage father in my junior year and I live in New Jersey and my son lives in Colorado. I need to know how to file for custody of my child.

Has the mother/child lived in NJ in the last few months?

You have to file in the state where there is legal residence. If they have just moved from NJ that may be where if they have lived a certain time in CO, you will have to file there.

Are both of your minors ( under 18) another issue