I assume SATA. Just install your OS on the drive. Windows will make itself the primary boot partition. You can also use the disk to find previous installations and get the option to boot from them aswell.
As for the raid 0, I am unsure how this will affect things.
I dont mind wiping the drives and starting fresh just wondering what kind of raid configuration would i need in order to have all 3 drives work together but keeping my os on the ssd and all other files on the 2 WD drives.