My suggestion is that you focus on getting the basic wiring done first:
1. Wire the power supply (you do have a power supply, right?). You will need an AC cord to plug it into a wall socket. Then you will need to hook the power supply to the Gecko per the Gecko instructions.
2. You will need to wire each motor per Keling instructions to the Gecko 540 through a DB9 plug. You also need a current set resistor according to the motor amperage - sized at 1000 ohms per amp of motor current. If your motors are 3.5 amp, you will need 3.5 k ohm resistors. This resistor gets hooked between pins one and five of each DB9 connector, per Gecko 540 instructions.
3. You need to wire an e-stop per the Gecko 540 instructions.
This should get everything moving. You could later add the home/limit switches and a relay to get the router motor on or off under software control, but those are really optional.
Here is the ref to Gecko instructions/wiring diagram:http://www.geckodrive.com/upload/G54...3%20MANUAL.pdf