Is it petrol or Diesel? Im not really clued up with your car, but a clutch generally comes as a kit.
Clutch, pressure plate and cylinder is the general kit.
If its DMF, then that might be the deal braker. Again, I dont know the car so, not sure. Petrol engines generally dont have DMF, especially of that age.
Id ignore the grinding in second if you cant engage any gears when the engine is running, then the clutch is 100% the first place to start looking.
Hopefully its the master cylinder... that way its the easiest fix of the clutch system. Has it lost fluid? Any wet patches under the car when its parked?