Write a step outline instead of a full movie script. Step outlines provide details of what happens in each scene and leave it up to the actors to ad lib the dialogue. The result is realistic, spontaneous dialogue that could add natural tension and suspense.
Hire amateur actors. Amateur actors often put their best foot forward, even when very little pay is offered, to build their portfolio and break into the movie industry. You can find amateur actors to hire by placing ads in college newspapers and posting notices on bulletin boards at music and performing arts facilities in your area, such as community theater or comedy club venues.
Shoot footage with an inexpensive video camera. Unlike expensive movie cameras that produce picture-perfect shots, inexpensive cameras can provide the grainy and slightly unsteady footage for which "The Blair Witch Project" became famous. Such cameras can be purchased at your local electronics store and online.
Pick a secluded area to shoot your movie. Isolated areas can create a natural sense of fear and suspense. "The Blair Witch Project" was shot on location in the woods in Maryland. To create similarly scary scenes, shoot your film in the woods, in a desolate field or in an abandoned building.