Writers?

Yeah, worldbuilding is hard stuff while keeping your characters intact.

Also since you seem to veer towards fantasy I warn you now; there will be a tremendous amount of "research" involved in order to craft a world of fantasy. Also keep in mind your readers, who will want to read this story, what age group and denominations would find this intriguing? Is this a Young Adult Fantasy story or a Hard/Soft-core Fantasy story?

I once spent three months doing nothing but world crafting before I ever evolved the characters and the plot; sometimes that is necessary since part of my world crafting were the innumerous systems of magic and psychic prowess; other times it isn't all that necessary. Part of writing novels is discovery and an open mind. So reach out, do the research and go for it.

Yes, I know. I've had to do research before, and consider my audience. I learned 99% of that in Brandon Sanderson's "Writing Fiction" class at BYU.