Your Mac requires a FireWire port to go into FWTDM. 6-pin to 6-pin FireWire cable to connec the two Macs together. The one in FWTDM will mount as an external hard drive on the Mac it's connected to.
MacBook Pro (15-inch, Mid 2012) 2.3 GHz Core i7, 8GB, 256GB SSD + 500GB HDD + 1TB FW800 OWC Mercury Elite Pro mini
iPhone 6 4.7" 64GB • iPod nano 8GB • Sound System Audio Engine A2 • Display UltraSharp U2412M 24"