Fatfool
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For gpu, i believe flow direction works both ways. For cpu, most brands have direction indicated for inlet and outlet. Best is to follow as their design might be specific in this direction.
Arrow pointing towards hole is inlet and arrow pointing away from hole is outlet.
For tubing, i would recommend to go for 3/8, 5/8. Reason is that it is more flexible than other dimensions. And DO NOT do a direct conversion from inches to mm (3/8' to 9.5mm) You will get leakages. If your tubing is 3/8 5/8, find a fitting for 3/8 5/8 instead of 9.5mm.
Lastly, to save $$$, subscribe to performancepcs newsletter. They occasionally will send discount codes during USA holiday dates. Latest for father's day are as such:
3/8" is a good size to start with. But for even more tube flexibility there's actually 1/4" as well.
Less popular in the US but European brands still carry a similar one.

I'm kind of lost here with the inches, but I feel 14mm is easy for bends though