Arduino UNO R3 + Motor Shield R3 + 12V 200 Step Stepper Motor

Okay, yes i'm new.

So far I got all my sensors working properly but i'm stuck with the stepper motor.

First off, I know the motor needs it's own power supply, I saw a few pics of a 9V battery being hooked up to the MotorShield in VIN + GND, if i have a 12V Motor I obviously need to hook up 12V to it correct? If so do i need a resistor at all or does the Shield take care of that.

AND, what's the wiring on the motor? can't seem to tell which wire is which. this is the motor i have.

Thanks for all the help in advance!

You have four wires. Hook them at random to the four motor terminals: A+, A-, B+, B-. If that works, you're done. If you only get humming or jerking swap A+ and A-. If you get no action, swap A+ and B+ and if you then get humming or jerking also swap A+ and A-.