Many times when a tractor (or any manual shift vehicle) sits for a long time the clutch disc gets stuck to the flywheel. I have found that 99% of the time if I can get it started in gear and drive it around the yard while varying the throttle up and down the disc will free up.
1977 AC 7000, 1980 JD 2840, 1963 Case 930, 1963 Ford 4000, 1943 Case SC, Case 530CK backhoe
I am not familiar with your machine but I have bled car hydraulic clutch. Follow the tube from the clutch master cylinder to the slave cylinder (it will push on the arm that presses on the center of the pressure plate) and look for a bleed fitting. It may be inside the bell housing but there should be an access panel that can be removed so that it can be serviced.