Requirements to legally live in New Haven

Hello my name is Jonathan, I live in Costa Rica, I heard about the opportunity in New Haven USA, what requirements do I need or what help exists to legally live in New Haven?, please someone tell me something about that, how can I be worthy  of that great opportunity to start a new life in New Haven.

US immigration is based on federal not state or municipality level. You can read up on all visa options on uscis.gov which is the official site.