Need more help with world-building? Have a look at World Building Projects for some inspiration.
For fantasy, I’ve actually found this Fantastic Armies article to be helpful and not just for battles. It lets you know when your population dedicating to fighting and other pursuits, is reasonable and when it’s off-base.
For religions, I like to hit up my personal favourite: The Writing Cafe for help.
Linguistic help? The Language Construction Kit is the best I’ve ever found.
I’d better not overwhelm. Hehe. Let’s just say, technology is wonderful! Literally thousands of resources right at one’s fingertips!