Well you have choices?

The stepper driver is an all in one affair and as Jazz says, it could take a while to find out what is what?
If they were individual drivers it would have been easier?
Buying, drivers and a BOB (breakout board) will be quickest

You can reuse all the switches etc so would be very straight forward.

can you give us a pic of the whole machine and some dimensions? Also what markings/ how many wires etc are on the steppers?