hi,
this linux is not totaly , but a lot like raspibian, the raspberrry pi debian system.
you should found good tutorials for moding you consoles from pi comunity too.
first of all, you should download the last image of OS here :
http://106.185.33.196/clockworkos_v0.3.img.bz2
once downloaded, use the file to flash you SD card via Etcher
put SD on console, build it , charge it, put wifi connection on settings.
once done,
for simple ROMS transfer follow this tutorial
for Command Lines use this video and ssh info given on the filezilla tutorial
for expand you Os to take full SD card seize, use this comand line tutorial via putty ssh :
for retroarch configuration here is how they do on raspberry pi (not sure we have a thread here if someone can help me on this)
i think you be now good for start with you new console 