Considering my specs, and that I already have my OS on the SSD, is it worth it or possible to make a RAID? If so, which one?? Thx!
Nowhere near enough info here man. What are you trying to accomplish? Are you talking about connecting another matching SSD in Raid 0 to install your OS on? Making an a separate RAID array using mechanical HDD for data/media storage?
If you mean adding a second SSD to your machine, and building a RAID array you'll have to make a backup of the OS to restore back, or reformat. As others have said there's not enough info to know what you want to do.