I was on the road stopped with clutch pedal compressed, then when released pedal rose very slow and was very stiff. Now pedal is loose when compressed 3/4 of the way then engages at the very end of travel. All the fluid is gone as well. Where is the first place to look for a leak? I was driving around when this happend so there are no drip marks on my driveway or even signs of a leak but I guess there has to be one.

 

Look around the slave cylinder and also where the metal lines meet a rubber line near the slave cylinder. If you see fluid or you've found your leak.