Cipher Zero X

What is the best way to register blocks and items? I am a beginning programmer trying to make a mod for Minecraft 1.12.2. Below are screenshots of my current registries in Eclipse Oxygen.

Thanks so much!

I am following an Internet tutorial on how to set up my workspace in Eclipse: http://techwiseacademy.com/minecraft-modding-setting-up-your-environment/ I have done everything it says to do, but I'm having one problem. I can't import my folder that has Forge's code in it to my workspace so I can access Forge's code and start building my mod. Does anyone know how to help me?