pump your clutch pedal, it took me around 2 minutes of non stop pumping that thing to build up pressure. once it has pressure, it should be good to go.
if not, it's possible there is air in your system and your slave cylinder needs bleeding.
also, make sure your brake fluid is topped up.. (brake fluid reservoir is also used for your clutch). It should be ABOVE the 'fill' line for fluid to pass into the clutch system.