Timing belt

Um. The cam (the little hole in the gear) and crank pully are marked for tdc. But if the belt stopped turning the cam and the engine was running you need a new engine because I believe that it is a interface engine. :Cry:

First, get yourself a library book on your car with photos for it is a complex procedure. And you need tools. As was said the timing gear times when the valves open(when the piston ain't there) and close(before the piston gets there) because they will hit each other if they both are open and up.(New engine).
So, even if you can't get a library book, read up info about the procedure and if in doubt take it to a mechanic. At this time I would suggest that the car be towed if teeth are missing. You may be lucky that the belt tightness was great enough not to have it slip yet. But this is not driveable.

There is no book for your car but a nice mechanic may give you a "Mitchel on demand" print out. And from experiences most mechanics will not touch your car with out doing the head job. THE TIMING BELT DID SLIP! They slip when the engine is stopped and started even with teeth in certain conditions. If you tried to start it and it didn't turn. Then you found out it was the timing belt. You need. Cylinder Rebuilds, a head job if not a new head, and all related parts.
If you just caught it then ok Do what he says. Otherwise be very wary of an mechanic who says it's a minor repair.