The center hole is for the time train, the right hole is for the chime train and the left hole is for the hour strike. Just wind them up until they stop. Over winding is a myth. If the clock does not run it is either dry, dirty or worn out. A mechanical clock can be repaired at most "good" clock repair shops. If your clock is an 8 day, you wind it every 7. This way the clock does not stop between winding.
Stevens Clocks, June 2010