Southpaw (left sided numpad) allows you to use the numpad and mouse at the same time. Split allows placement in a comfortable manner for long sessions. Right side layout to maintain the functionality of a full size board in a much more compact manner.
Make example for this keyboard (after setting up your build environment):
make viktus/sp111:default
Flashing example for this keyboard:
make viktus/sp111:default:flash
See the build environment setup and the make instructions for more information. Brand new to QMK? Start with our Complete Newbs Guide.