The tail motor spins to counter act the spin of the main rotor. It doesn't spin both ways, just on or off with throttle in between. If you move the stick to 9, then it will spin counter clockwise. If you move it to 3 then it will fly clockwise. The tail rotor goes really fast, 4-5 times faster than the main blades, so if you trim the tail off, then the helicopter will naturally spin CCW.

Hope that helps, and I hope I'm right