Also, is there anything that I should know, as far as customs, etiquette, etc, that might be confusing to me while I'm out on the town.
note that being underdressed will get you refused entry into most clubs in the center. other than that no special ettiquette tips need be mentioned, Polish clubs are just like anywhere else.
I second the vote for Klubokawiarnia, unique Polish socialist-realist decor, good music, and a good crowd. Cinnamon has been the yuppie hangout of choice for a while now, Organza isn't so bad and there are plenty of pubs and clubs up and down the little street its on (ul. Sienkiewicza), which makes it a good place as any to start out..