Apps not showing .How to reinstall the factory apps
Sounds like you removed the launcher (homescreen) along with some other critical stuff.

For now, go to Settings and turn on USB Debugging, plug into your PC, install appropriate drivers, and sideload another launcher app, so that you can see all your apps and backup data. After backing up, flash a factory firmware via Odin from your PC to get a fresh start (you do need to root again).