EKWB has a good shopping cart configurator.
I would give you my shopping list, but I haven't finished and my last build was a custom closed loop (so open loop just with no reservoir).
my shopping list also has a lot of custom shit made up so it wouldn't work for you seeing as I'm making a custom psu shroud / reservoir / pump combo and had a custom radiator made and installed as well.
basic parts, list that I would recommend
EK/Hardware labs/alphacool Radiators (and fans) (I recommend atleast a 360 if cooling cpu and gpu, but if you can fit either a 480 or 2* 240 go for it)
Ek D5 pump+res combo
2 fittings for every component plus any additional angled fitting required
Cpu Waterblock or monoblock (vrm and cpu, must be board compatible)
GPU full cover waterblock
tubing that matches fittings,
Coolant premix/concentrate
distilled water
kill coil
pt nuke
maybe some temp sensors if your motherboard supports it.
are you looking at watercooling and need help? or just interested in other peoples setups?