Do you have your axis moving in the right direction? Do you have PronterFace working so you can send commands to the printer? If you tell the Z axis to move down, does it move up?
If an axis moves the wrong direction, you can flip these definitions:
// Invert the stepper direction. Change (or reverse the motor connector) if an axis goes the wrong way.
#define INVERT_X_DIR true
#define INVERT_Y_DIR true
#define INVERT_Z_DIR true
If an axis moves the wrong direction, you can flip these definitions:
// Invert the stepper direction. Change (or reverse the motor connector) if an axis goes the wrong way.
#define INVERT_X_DIR true
#define INVERT_Y_DIR true
#define INVERT_Z_DIR true