Before you turn your story or novel into a screenplay, you must first work on the story and make it screenplay-worthy.
You need to handle these points below.

(1) Decide on the length of the screenplay you wish to obtain.
The duration of a feature film depends on the number of pages of its screenplay. A page with courier font style, and font size twelve is equivalent to one minute of screen time. Sixty pages is equal to one hour. A normal feature film should be about ninety pages, that is one hour and thirty minutes of screen time.
The reason for this analysis is that not everything in your novel should be in the screenplay; you need to cut somethings out. Or the other way round, if your novel doesn't have enough content to make a feature film of one about hour thirty minutes, then you need to add more content to the screenplay.
In both cases, you can adjust (increase/decrease) the number of characters, actions, dialogues, scenes and props.
Sometimes this proves difficult as it's not easy to just eliminate some characters because it may affect the whole story and consequently may cause frustration to the writer. Anyway, a way out is to eliminate unimportant scenes, and then say what happened in the scenes through the dialogues. As the unimportant scenes are eliminated, some characters that appeared just only in those scenes are automatically deleted.
Again you need to choose the dialogues that pulsate with actions.

(2) Correct the Point of view
A screenplay is written in 3rd person point of view. This means you must adjust your novel if you wrote it in 1st person continue reading here https://scriptsandpapers..com.ng/2016/11/to-turn-your-storynovel-into-screenplay.html

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