You really have to be more specific with your question. Nothing is "required" of you. How much or little worldbuilding you wish to do is completely dependent on you. If you have a question related to worldbuilding, no matter how big or small, you can state it here and people will help you out with it. I know from personal experience.
Hail and well met Jdailey1991
Good to have you here.
If you have a question, ask.
If you have an answer, tell.
Hope you enjoy the place as much as I do.