This is going to be short and to the point. Whether you are writing sci-fi, fantasy, dystopian, or whatever--go to SFWA (Science Fiction and Fantasy Writers of America) Fantasy Worldbuilding Questions.
There are questions to cover:
- The World Basics
- Physical and historical features
- Magic and Magicians
- People and Customs
- Social Organization
- Commercial, Trade and Public Life
- Daily Life
I cut and pasted all of the questions into a word document. It is a 36 page list of questions! You can get it Here.
When reading, what pulls you into the world better than anything else?