AlAan Media
Good sound is often more important than good picture. Capture clean dialogue with a lavalier or shotgun microphone placed close to the speaker, and record a few minutes of room tone at every location. Room tone gives editors a natural base for smooth transitions and covers small gaps in the edit.
Layer ambience and effects to place the viewer in the scene, but keep them lower than the voice. Use music to shape emotion rather than to fill silence, and leave space for moments that need no soundtrack. Check your final mix on headphones and on a phone speaker, since most viewers will hear the film on one of them.