[ODIN][VRALJB] Restore to Stock - xda-developers
That will return your phone to 100% stock. From there I would use the thread that Bk provided yesterday for unlocking the bootloader: Jailbreak(bootloader unlock) / Root / TWRP Recovery -- Even after update [26JAN13] - xda-developers
On all of your downloads be sure to check the md5 sums in order to assure you have a clean download. And then follow the instructions very, very carefully. I would also recommend that you read those two threads (yes I know they are jillion pages long, but they both contain some great information).