Also on the 3 axis combo, the last item on the tutorials page points to wiring instructions and links to videos. The (I assume) written instructions do not load and the videos seem to be unavailable

There are written instructions located at each component (product) page. On the page for your interface board, you will see a datasheet that shows the wiring diagram from that board to the drivers, limit switches and computer. On the page for the stepping motor that you have, there is a datasheet that shows the wiring scheme from the motor to the driver and also has the amp rating for configuring the driver. Additional Information: Additional Information: Additional Information: