How do I create and define a new term? Can I apply for a patent?

You can't.

Patent Law Article 2 Invention-creation as mentioned in this Law refers to inventions, utility models and designs.

Invention refers to a new technical scheme proposed for a product, method or its improvement.

Utility model refers to a new practical technical scheme for the shape, structure or combination of products.

Appearance design refers to a new design with aesthetic feeling and suitable for industrial application based on the shape, pattern or combination of products and the combination of colors, shapes and patterns.