Hey Anthony -- you could start by looking on Craigslist.org or do a search through Yahoo Groups for Argentines in NYC (is Long Island close, sorry my geography is failing me at the moment, I may have placed you on the other coast entirely!)
Try to find a Porteno/a to teach you -- it will help a lot with the accent when you arrive. If Craigslist doesn't turn anything up have a browse through the web for latino/hispanic community centres / cafes etc that are nearby -- they may have listings for teachers or be able to set you in the right direction.