Setting in writing is a lot like editing in a movie: if it’s good, it will be part of the story without drawing the reader’s attention and help with the flow of the story. Below are some links to help kick-start writing about the setting(s) of your story.
Melissa Donovan’s Fiction Writing Exercises For Developing Setting
Ginny Wiehardt’s How To Employ All Five Senses in Creating Your Setting
Suzannah Windsor Freeman’s 21 Writing Prompts for Setting a Scene in Your Novel (more appropriate to say 21 questions to help with setting)
Michael Noll’s How to Introduce Setting
Springhole’s Setting Generators