Satchid,
Ger21 is right. If your board is a unipolar board then you do not have a choice on how you wire the motors. The PacSci data sheet will give you all the info you need to wire them. The following link is an installation bulletin from the Xylotex web site for the PacSci motors. It is only two pages and has the wiring diagram for Unipolar on it.
http://www.xylotex.com/PacSciIB.pdf
The full PacSci documentation is at:
http://www.xylotex.com/PacSciDS.pdf
The HobbyCNC site indicated that you do not need external ballast resistors. The current is adjustable on the board.
Marv