Clutch help needed

[Tater]

So, here's my problem: I took my kids out for an afternoon of trail ridin yesterday and my clutch went out. It worked just fine when I left my apartment but, when we got back in the Jeep after finding a geocache, the clutch wouldn't sinc up the gears. I had to shut it off, put it in gear and start back up. When I started up in gear (with the clutch pedal engaged) my Jeep started rolling forward as if the clutch wasn't engaging at all I'm thinking (hoping) that the clutch master cylinder blew a seal since it went out so fast. I've never heard of the clutch plates going out that fast. How do I trouble shoot this to see if it's the linkage, clutch master cylinder or the clutch itself? I'd rather not shell out $250 for a new clutch if it's something else. Any help is greatly appreciated. Thank you.