Scary movies are hard to write. The Horror genre is sometimes looked down upon by audiences and screenwriters because of their low budgets, exploitative cheap thrills and over-use of blood & gore.
Many aspiring screenwriters struggle to identify their audience. Their first port-of-call should be genre. Why they might ask? The answer is straight forward; If you know the genre the audience identify themselves, because genre is how the audience identify the film that they want to see.