Are you close? Step 7 and afterwards is fine, steps 3, and 4 won't work.
You can't switch to RAID mode with an OS installed in AHCI mode, it won't boot. If you feel up to a registry edit to perform that change, Google on "switch from AHCI to RAID mode". Microsoft had a hotfix for this for Windows 7 (your OS is a mystery), hopefully that still exists, I've never used it. With the RAID driver installation as part of the fix, it should work if done correctly. Otherwise you must install Windows in RAID mode.
You won't be happy with the SSD's performance, at least in benchmarks, using it on the Marvell SATA controller. But we don't know what Corsair SSD you are using, so it might not matter.
Your new 2TB HDDs for the RAID array may be called "SATA III", but no HDDs can even surpass SATA II speeds, just a reality. Plus RAID 1 is not about performance, just redundancy. Don't waste the Intel SATA III ports on HDDs, save those for SSDs.