Compatibility of water cooling loop parts

[omar80747326]

If I am collecting parts for a water loop, how can I be sure about the compatibility of parts before I buy anything even if I've got parts from different manufacturers?!
Parts:
Phanteks strix 1080 ti OC water blocks
Alphacool xt45 420mm and 360mm radiators
Ekwb x299 pro carbon ac rgb monoblock
Ekwb hard tubing 10/12mm 50cm 2pcs
Ekwb RES x3 250 rgb reservoir
Ekwb stop revo d5 plexi pump
Ekwb HDC fittings 12mm g1/4
Ekwb angled 90° adapters g1/4
Cooler master h500p case

In addition, Please I need to know such an idea about what are the meanings of numbers and letters used for water cooling fittings, adapters and tube sizes like g1/4, 10/13 and 1/3!?

 

[omar80747326]

But must I plug the plug in the PSU 24-pin and power the pump just with connecting power cables to anything else, or this would be normal since the plug prevents the system to go in full boot.

 

[rubix_1011]

Here are the steps:

1) Build your system, including all fans, drives, watercooling, etc
2) disconnect the 24-pin ATX from your motherboard, plug into this
3) power on PSU, this will power your 12v accessories and fans, will not power on your system because not plugged into the board.