How to run 5 wires hibrid stepper motor with arduino uno?
1) it is probably something like A1, A2, Common, B1, B2.  You could confirm this with an ohmmeter. Common to any of the others would be a certain resistance X, while between any of the others (A1-A2, B1-B2, A1-B1, A1-B2, B1 A2) would be 2X. 

2) You can't.  It is a unipolar stepper.

The EasyDriver faq number 5.1 at http://www.schmalzhaus.com/EasyDriver/ says:  "... The only kind you can't use is 5-wire stepper motors. (They need uni-polar drivers.)"

The difficulty with the 5-wire steppers is that they short the middle of the two coils together, which makes it hard to drive the coils independently.

Since you have the motor open, you might be able to do some surgery and disconnect the centers of the coils from each other, but you'll probably be better off getting a 4, 6 or 8 wire stepper instead.