Hi,
You should tie together one wire of each coil. This will be the fifth wire that will eventually be plugged to the +12V of the driver power supply. According to the datasheet of your motor those wires could be: RED, ORANGE, YELLOW and BLACK.
Now, to find the proper sequence, use a 9 volts battery and plug those 4 wires to one side of the battery and by touching the other side of the battery with each remaining wires, one after the other, you will soon find the sequence. Putting some scotch tape on the axle will help.
(My guess is : RED/WHITE, YELLOW/WHITE. ORANGE/WHITE and BLACK/WHITE but I could easily be wrong.)
This motor could be run as an unipolar or as a bipolar motor.
The driver is unipolar and I am guessing that It will give only a full step sequence, that is always 2 phases energized at the same time.
The sequence would be like this:
XX00
0XX0
00XX
X00X
With this driver, the motor could not be run from the 12v. supply without a proper ballast resistor.
Here is some little drivers that I made using the same logic chips:
https://www.youtube.com/watch?v=BAvMMzYG5r4
Alain