Here are one or two thoughts about the setting of your story, just to get you started.

You need to consider not just where you locate your narrative geographically, but also where you set it in time as well. I often find that researching both of these aspects throws up some fascinating fact or other which goes on to influence the development of the plot, so you need to firm up your ideas about setting early in the planning stage.

Where you set your story in time will almost certainly have a bearing on your story development, not just on the events you relate, but also through the potential you will have to move about in time, from the past to the present and back, or even into the future. This can be a great help in beefing up the pace of your narrative.

Where you set your story in time may also have a bearing on character, not just in terms of how they behave (conventions and social customs are different in every period) but also in regard to how they change over many years, the effect of time upon them.

The physical location of the tale can also throw light on your characters - Thomas Hardy is a master of this (as of everything else). In The Return of the Native, Egdon Heath illuminates the characters of Diggory Venn and Eustacia Vye. Setting can have a profound symbolic effect — think of Tess lying on the altar at Stonehenge at the end of Tess of the D’Urbevilles and all the resonances which that image fires in the reader’s imagination.

Think about creating texture in your narrative by working up some tension between character and setting, by not just showing your hero or heroine in sympathy with their surroundings, but also at odds with them. It’s another tool in the box for adding depth and interest to the tale that you are telling.