Check out my world building questionnaire that I use when starting new projects.
Please note that you may not need all of these questions depending on your story. Please feel free to add questions to this list and make it your own. This is just a rough outline to help you feel like you are standing in the heart of this world that you are creating. Consider yourself like a god. What you say goes. If you want an elf to be an ugly short creature with warts on their face instead of the majestic creatures that J.R.R. Tolkien has created them to be, you go ahead and do that! Be confident in what you are creating and consistent. Also consider the answers for some of these questions for the upper class and lower class of your society as they answers will be different.
R. S. Twell's Writing Tips
Look mom... I wrote a book, and now I'm helping other writers with their dreams! Check out my latest thoughts here. The Field Agent is my debut novel, and the first book in The Agent Bennet Saga.