Here is a huge thread.
They talk about that driver and show images of its use and settings.
Towards the bottom is a wiring image that should help you get started.
You can use the existing stepper motors. Just use shielded wires.
I had some issues with mine until I got some new shielded wires for the control signals.
You will also have to alter your settings as well and its talked about in the thread.
I did do this a couple of years ago myself but I decided to get a Gecko 540 and upgrade to Mach3.