if the cars been sitting its entirely possible the rings are rusted to the cylinders.
you may consider pulling the plugs out and pouring something in there to loosen it for a few days first, then trying to get the cylinders move by rocking car with engine in gear.
you want to be pretty sure its ok before attempting a 'proper' start
you should also actuate the clutch while rocking the car in gear to confirm the gearbox isnt the problem (rather then engine)