First, you want to research which companies are producing your genre (and literally call the office to be sure they are still looking for that genre. Just because a producer made it big in horror doesn't mean she is still looking to make horror films twenty years later).
Second, you want to register your work with the WGA (you can do this on line). You may also wish to register it with the US Copyright office.
Third, research the submission policies. Some companies accept an unsolicited synopsis, some will only read a script when submitted by an agent or an attorney, and others will listen to pitches at writers' conferences and pitchfests.
If you're looking for a great resource for writers, check out Jen Grisanti Consultancy
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