You really should ask this in the Verizon Galaxy S3 "Rooting, ROMs, and Hacks" sub forum. But I'd be thinking in the direction of going back to rooted stock, there's guides and links to the right archives to flash using recovery or download using Odin over in XDA-developers forum, and try again to flash CM. Or just go back to stock and either start over from there, or stay with stock for a while. Depends on your own preference. But you have several choices of ways to go from where you are.