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A screenplay is most likly used for making a movie. You could be wantng to write a stageplay instead.
Both have their own formating. You could search using google for screenplay formating and stageplay formating. Then compare the two to see which one fits best for what you want to write.
There are websites with samples of both screenplays and stageplays.
A screenplay is more for dialoge and less for the descriptions and other things needed when making a movie.
I don't know much about writing a stageplay. I have never tryed to write one.