Once at the level of thought,the theme of your screenplay blossoms-strikes a humanist chord,becomes human enough to arouse human interest,something begins to happen.
You begin to see on the film of your mind, shots adding up into pictures, pictures into compositions,compositions into scenes etc.All with your eyes still shut and you still thinking!
Painstaking as this exercise evidently is,i recommend that all screen writers should engage in seeing with their eyes shut i.e through the film or mirror of their minds.Whatever that means,it is a necessary tool,an inestimable asset.This is due to the fact that, maybe unwarily but definitely not thinking about writing screenplays,PLATO offered a useful hint that what we see, in the real World is not made of the materials that appear,they are products or an extension of another ethereal world;identified as the world of thought or thinking.
This view however,represents the blogger and is not necessarily applicable to all screen writers.I am aware of colleagues who approach screen writing from a basically art for art's sake perspective{screenplay for art's sake if you like);and they include successful hits.There are others too,who like me,pursue screenplay from an art for life's sake angle;which makes it all-encompassing to capture and promote our universal human existence and essence,in a capsule known as film.
Whichever is your view,the art of screenplay writing is a challenge which requires unalloyed commitment to the mining of raw materials for the sustenance of the film industry.