Res > Pump > CPU > Chipset > GPU > Rad
Always have the GPU last in the loop because it runs the hottest.
People recommend having the reservoir above the pump (gravity feeds the pump and takes some strain off it) Some people also recommend the Res been the highest point of the loop because it bleeds the system easier.
For Rads you will most probably need a Thermochill 360 of some sort, they are highly regarded and with a GPU in the loop you need a decent rad + fans!
For a Reservoir it is up to you, whether it be a fillport or a res. I like a res because i found it easier as a beginner.
For a CPU block everyone will say the D-Tek FuZion. It is a great block but i don't know why people don't recommend the XSPC X20 Delta. It is practically half the price and performs on par (sometimes 1C higher than the FuZion when the system is OC'ed)
For tubing, people recommend Tygon. Which is very expensive stuff, i use generic stuff and have never been disappointed.
For pumps the D5 is popular because it is a little work horse, and you decide how much you want it to work. I like my Laing DDC (which are awesome too, a little bit more expensive though) With a decent top on it they run pretty damn good
for Coolant i wouldn't get anything other than Feser 1. It is UBER cheap compared to everything else, it is de-ionized and outperforms all the other coolants. It has the best variation of colours and i can say it is pretty good stuff.
Hope some of that helps.