Bleeding a clutch is a lot like bleeding brakes, the goal is to get the air out of the system. Somewhere near the slave cylinder is a doo dad that looks a lot like a zerk fitting. You loosen it a quarter to a half turn to allow air or fluid to pass. It's more easily done with a second person to depress the clutch. Loosen the doo dad, have them depress and hold the clutch, then tighten the doo dad, then they may allow the clutch to go back up. Repeat until you get fluid and no air out. It is helpful to have a clear hose attached to the doo dad going to a small container of clutch fluid. When the clutch is depressed you can watch the air go out of the system. If the clutch pedal is inadvertently released it reduces the likelihood of pulling air back into the system, too.