Industry Presentation Conventions - The Guidelines
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There are several rules you must follow while writing a script:
You must state in the top left hand corner of your script where the scene is taking place INT. for Interior or EXT. for exterior, meaning outside a building. This is followed by the name or setting where the scene is taking place and it must be wrote in CAPITAL LETTERS.
When doing a characters dialogue, their name should be in CAPITAL print which should be centered on the page, the dialogue of the character should then be wrote underneath their name, also centered.
You can add in the setting the scene information like " a man walks into a bar, wearing a grey tailored suit, sporting stylish sunglasses on top of his head, he sits in a dark booth the far end of bar, out of obvious sight and slips an envelop out his waist coat pocket which he places on the table" This just enables the script reader to get some context and it establish's the scene.
I currently had some work with script writing and a famous script writing program used is Celtx. Here's an example of how a script should be set out;
