I need help big time.. yes i am a noob topic

So i had the upgrading android problem constantly happening when i rebooted my phone i found a thread and it said to delete the odex files in system i believe so i deleted them in my system data file. i restarted my phone to see if id still have this problem and i didnt but now i have a new one my 4g lte boot screen for my s3 repeats itself.... and now i cannot use my phone at the moment besides recovery. So can anyone save me in my time of need? i am running stock rom root gs3 jb 4.1.2