I need some basic help re the Numark NS7FX digital mixer...

I'm a green newbie in the world of digital mixing, trying to re-create and improve on the analog mixing experiences of my college days, and I just got the Numark shipped and ready to go... except I can't load any tracks onto it due to my severely limited digital audio tech on hand. I have no iPhone, ipad, cell phone or even stand-alone CD player - just my desktop PC, equipped with CD/DVD/Blu-ray player/burner capability. I thought this would be enough to download CD tracks from my PC straight into the driver, but I've been subsequently told that I need some mp3 type of media and/or to use iTunes to transfer song tracks and manipulate them on the mixer. Is this true, and is there any other way to do what I want to do? Any help or advice would be much appreciated.

Thanks in advance for whatever you can offer.