where can i find the rigth timing marks for this 94 jetta

The "0" may not indicate top dead center, so make sure you line up all the marks according to the repair manual instructions. It's been awhile since I worked on one of these, so it is always good to get a good manual before attempting this repair. Here are a couple of good ones: http://bit.ly/mitchell_repair_manuals_online http://bit.ly/Bentley_Repair_Manuals

There is another timing mark on the camshaft sproket.Still another timing mark is on the crankshaft pulley. To use those you will have to remove the plastic that covers the timing dented belt. Some times it could happen that the mechanics leave a flywheel wrongly placed after working the clutch. So you better use the other marks. There is still another one on the distributor; aligning the rotor would let the number one piston be on top.