http://www.pcworld.com/article/2144766/the-beginners-guide-to-proper-pc-cable-management.html
http://www.instructables.com/id/Guide-To-Computer-Cable-Management/
https://www.youtube.com/watch?v=fhxOTfXZTOs
time to read and watch a video

there is no set way... its something you "work at"