Hello community -
I have an idea for a project and need a few pointers. Let me preface by saying that my background does not include wiring or physics of any kind - NOOB 
That being said I have a Model B RasPi, a Wiegand RFID Reader and associated Fob(s) and a PiFace.
I am looking to attach the PiFace to the RFID reader and when there is swipe of a RF fob that matches a database of approved fobs - that the garage door opens. Cool right?
I have one of those keypads - but the buttons stick and its a general pain in the rear.
The RFID reader has the following wires hanging off of it with the descriptions right on the reader -
Red - 5.0-16.0 VDC
Blk-Gnd
Grn-Data0/Data
Wht - Data1/Clock
Drain - Shielded Gnd
Org - Green LED
Brn - Red LED
Yel - Beep
Blu - Hold
So I would obviously need to attach some of these wires to the PiFace - as well as the wires that are currently attached to the keypad to get this working.
Like I said - totally clueless - I am sure I can figure out the Wiegand and code stuff - the wiring itself is where I have no clue 
Anyone have any pointers? This is my first real foray into wiring up things like this.
Thanks community.
