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If you're interested in writing movie scripts read a couple online, some are pretty easy to access if they are a bit older, just type in the movie title and script into google. If you really want to get into writing scripts, get Celtx, it's a program that formats the writing into script style. It's a very helpful and fairly easy program and it auto-formats itself.
If you're interested in writing plays I would recommend reading a couple of short ones to inspire you such as, A Streetcar Named Desire and Our Town.
Hope this is helpful,