Lastly for the radiator, I am thinking about this which would go on top of the case where the mounting area is
I think those are the basic parts I need for watercooling as long as I got everything right
However, I have a few questions
How does setting up the tubes work? Is it as simple as putting the barbs in each thing (GPU, the Resovoir/Pump combo, CPU) and then putting the tubing into those? Also, what size tubing/barbs do I need (And do I need different size tubing/barbs for each different component)
It's a good pump that's used: PMP400 is the Laing DDC, otherwise known as the MCP350 or 355 (depending on which exact version).
Rad is fine.
Tubing is a matter of preference. You are going to need at least one barb or fitting for each inlet/outlet being used and they need to match the ID of the tubing being used. There is some info in the sticky on tubing and fitting/barb sizes.