Advice on watercooling my system

[Daedalus0451]

What parts should I get to do it? what's a good guide to follow on doing it? Any general advice on first time watercooling. My budget it pretty flexible, with no real hard limits.

My Specs:
Windows 10
2016 alienware area 51 R2
Intel i7 - 5930K
Titan X (pascal)
32 GB of Ram
Samsung SSD 840 Pro Series

 

[Daedalus0451]

The CPU is already watercooled out of the box so I was just looking to watercool the gpu, someone did tell me that I should watercool both at once and take out the watercooling rig that came out of the box but I don't know if that's the way to go. I don't know how big a medium size radiator is I am a total noob to watercooling, but there does seem to be a lot of space in the case.
As said before I am a total noob so I wouldn't know the difference, what would you recommend?