Want help in making a new dimension Mod

Yea, I will help.

• Don't use end generation, Unless you are doing a mod with it. Its  99.99% void. 
• Make sure to generate lots of blocks. You can do that by using the spawn block tool. Make sure common blocks have a 15 - 25 spawn weight, and rare ores have about a 1 - 5. Other ores that are common should have around a spawn weight of 10 - 15
• Make sure to make custom biomes if you want to. Or just use regular. If you want one biome, Create a biome with identical blocks to your main dimension base blocks. 
• To spawn enimes, Just create them and spawn them unrestricted by using the mob spawning tools, Or restrict them to biomes

Just be creative. Make sure to add lots of biomes, blocks, mobs, and more. I am working on a dimension mod myself with over 240+ elements.

Good luck!