Are we talking completely from a new perspective? IE never done water cooling before ?
If so you are going to need two connectors per device to screw into the 1/4 holes (So two per rad, two per block , per pump etc.)
Example:
https://www.overclockers.co.uk/xspc...ession-fitting-v2-black-chrome-wc-102-xs.html
You are going to need tubing to match your connectors, so the size tubing to fit them.
Example:
https://www.overclockers.co.uk/mayh...ling-tubing-3-8-5-8-16-10mm-1m-wc-114-mh.html
You are going to need a res for filling and to collect air bubbles and a pump (the two maybe combined together)
Example:
https://www.overclockers.co.uk/xspc-d5-photon-170-reservoir-pump-combo-wc-272-xs.html
And some coolant, this is very much personal preference (I'm a deionised water and silver coil kind of guy myself)
On top of this you might require, a tube cutter, some 45 or 90 degree bends to allow you to route tubing. a drain port.
All I can say is, if your unsure, ask ask ask.
I made so many mistake near the beginning, If I had asked more questions maybe I wouldn't of wasted so much time
I *Think* the 1080 Ti runs quite a lot of watts, I am unsure how utterly amazing your cooling will be with just a 280 Radiator, but other people will know better than me.