Learn left, right, turn, stop, here, yes, and your address FIRST. Then you can go anywhere and always get home in a cab-- even when your phone dies.
Turn on Closed Captions on your TV! You'll pick up many basic words very quickly -- the colloquial way to say: okay!, yes!, yes?, no!, no?, wait!, and what?, which are said ALL of the time.
Learn the name of your country and state/ province/ area in the local language.