Most likely the clutch plate is rusted to the flywheel. That is common out here in the northwet. I just drive around using the hand clutch and depress the foot clutch now & then until it breaks free. Up hill and/or hard pull helps.
Top pic is factory adjustment of clutch rod to provide 1/8" - 3/16" clearance between the throwout bearing and the pressure plate levers. If you can feel the resistance of the pressure plate lever springs when you depress the foot clutch, adjust the rod free movement as measured at the bell housing hole. That will give you the clutch pedal free travel.
Bottom pic is inside the bell housing as split. If you don"t have pressure plate lever spring resistance when depressing the foot clutch, most likely the knob end of the clutch rod is broken off or has worn through the throw out yoke seat. Less likely the stud has broken on the yoke pivot ball.
There are other things in there that can go south, but if the initial rod adjustment doesn"t provide spring resistance you will have to split.