http://techref.massmind.org/techref/...pper/wires.htm will help you find which wires are which on the motor.
http://techref.massmind.org/techref/...onnections.htm the table below the graph will give you the options for how to connect the stepper to the driver. In your case, with the 6 wire motor and a bi-polar driver: The common A and common B are held apart and not connected to anything. A+,A-,B+,B- to bipolar driver with 41% higher voltage than the motor rating.
As to the polarity, I don't have a lot of experience with Bi-polar motors, but I believe it's the same as for unipolar motors: Just hook up the controller A+, A-, B+, and B- terminals to the phase leads (guess at the phases) and try to step slowly.
If the motor does not turn, try swapping one A wire with one B wire, you may have connected the motor phasing wrong. If you have the phasing wrong, the motor will tend to sit there and "wobble" or "buzz".
If the motor turns, but in the wrong direction, you only need to swap the two A wires with each other.