I find it really intriguing how these scripts differ in formats depending on the movie genre, the method of filming and the production. There is no one way of making a script and there are no strict rules that apply to it.

Here is an example: http://www.lc.ncu.edu.tw/learneng/script/TaxiDriver.pdf
This script describes the characters in detail informing us on their backstory, age, appearance etc... This indicates that the screenwriter intended to get the appearance perfect in the character. The script also mentions the sound effects that occur in the film. I'm unsure why this is but I imagine it's to give the cast and crew a better understanding of how they should present the movie to the audience.


(Source: http://flavorwire.com/441918/10-famous-film-scripts-and-what-you-can-learn-from-them)

Here is an interesting video of a man explaining the important of screenplay.

Here is a few images I found of Memphis. This will be where the story is set. I have chosen this location as it is a popular city in Mississippi as well as it's close to the Bayou.