bleeding is straightforward most of the time - look at a Hayes manual. You open bleed screw on the slave (next to the transmission under the vehicle) and pump out the air without letting the master cylinder go dry.
1990 Jeep YJ - 4.2 - manual
Or it could be a bad Clutch Master Cylinder...had to replace mine last week. Symptoms were...
1. press clutch pedal lightly and it had no resistance and went to the floor easily.
2. Pumped it quickly and it would build up pressure but once down to the floor any pressure was gone quickly.
Took about an hour to replace.
Owning a Renegade means being "Different"!