1. Write to direct. A screenplay, especially a no-budget screenplay is a very loose blueprint for a film – ultimately every choice you make will compromise something else.
2. Write for what you know and for what you can obtain. This goes for actors, locations, animals, and major propping or set dressing. If your friend owns something, anything, write it into the film.
3. Remain flexible. Recognize the essential element in a scene and allow it to take place in a variety of locations or circumstances.