What you wrote is confused. Unraid is not raid. It only uses Raid systems for the Cache Pools or if you used the ZFS plugins. Did you only ever had Cache Pool drives? Were you using ZFS plugins? Likely you did neither, and only had data drives. Every data disk in unRaid is its own self contained filesystem. The Parity drives hold values from a mathematical formula to offer protection and be able to recover data from failed drives.
As to steps for recovery, try what Jonathanm wrote. When you reassign drives in a new setup, never ever assign a drive as Parity if you are uncertain. The system will detect if the drives contain a valid filesystem if assigned as a data drive. When a drive is assigned as parity, it will begin overwriting what's on it with the calculated information. You dont want to do that with data drives.