how would I generate a biome in Minecraft like one of my choice aka custom
First you make the biome (extend BiomeGenBase). Look at some of the vanilla biomes to see how that works.
Next you register the biome with the BiomeDictionary and BiomeManager. Here's an example of how I did it in 1.7.10.
In 1.9, biomes also need to be registered using GameRegistry.register (like every other IForgeRegistryEntry implementation). I have an example of this here.
Chisel Facades: For all your decorative pipe-hiding needs.
Please don't PM me to ask for help or to join your mod development team. Asking your question in a public thread preserves it for people who are having the same problem in the future. I'm not interested in developing mods with people.