Sorry for the late reply.....Q1. No, i just cloned my SSD from my previous build. But yes you can uses a thumb drive to do a fresh install. Q2. You can install OS on RAID 0 or on just one SSD and use the others as back up SSD. I use use one SSD for backup and one for Steam files. Q3. lol no clue what you're talking about on this one. I'm no expert :). Q4. Yes.
Aight thank you sir!