Restore your stock ROM and start over. Only this time, do not follow YouTube videos to try and root because they don't explain anything. There is information throughout both the Q&A forum as well as the sticky posts in Development that you might want to start reading.
After restoring your stock ROM, you need to do the following, in order:
- Install ADB drivers on your PC, if you haven't already done so.
- Install StreakMod Recovery.
- Install a custom ROM such as PseudoCream, as custom ROMs are generally pre-rooted.
- (Optional) Install a different baseband.
To make life easy when it comes to installing StreakMod or the baseband files, download MultiFlasher from the link in my signature. It provides the tools as well as the recovery and baseband images. It DOESN'T include ADB drivers, but those are available from links in Development.