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Whether it is a rugged mountain town or the halls of Congress, you will need to create a world that is interesting and complex enough to draw your readers in again and again. Your main character should also be a natural part of their environment.  Setting can be used to establish a mood throughout your series. For example, if you are writing a gritty detective novel, you could focus on the dark alleyways and seedy underbelly of an urban area.  If you are writing a science fiction or fantasy novel, your setting will involve a fair amount of world building. You will be creating a new culture, government, terrain, and even climate. Similar to a character bible, you will need to create an ongoing list of information regarding key settings in your series.  Information on your list should include names of key buildings and streets; distances between landmarks, stores, and restaurants the characters frequent; and directional data, like which streets run north/south and which are east/west.  You should also include information on the paint color and furnishings of rooms commonly featured. You have a few options to consider when writing a series. Your character can age throughout the series relatively quickly, or they can remain pretty much the same age throughout (as in primary characters in long-running mystery series). If your characters will age significantly over the course of the series, keep in mind that other minor characters will need to age accordingly.
Create a setting readers will want to revisit often. Maintain consistency for your setting. Decide on how you will address the passage of time.