Help 97 TJ won't shift into any gear

Luvlifengod,
your profile says your Jeep is a manual. If so it has the same AX15 transmission as my 98 TJ.
a few Questions:
1) is the transmission full of fluid?
2) is the Jeep on level ground with room in front or behind to do a test on the clutch? if so I’ll describe a way to check if the clutch is disengaging/releasing.
TJBUD