Need some help with creating a custom biome

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Terrarian
I'm trying to make my own biome with custom stone, grass, trees, etc. but I'm having trouble finding any tutorials that aren't outdated. :dryadsad:

I've managed to make my custom ore spawn all around the world with WorldGen, but I'd like to create a surface biome that spawns only once, like the jungle or snow biome.
I guess this could be done by overriding whatever was generated below it and turning those blocks into my biome's variants?

(please try to explain it simply, I'm not very experienced! :dryadcry:)
 
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