Make a good trailer
The first step to getting good sales is to have an excellent trailer. To get an excellent trailer you need a good editor.
We’ve all seen the trailer will all the good parts of the film in it. Well that’s done for a reason to get people to by a ticket or buy the DVD. Make sure you brief your editor in what you want in the trailer and the ptich it should be making to the potential audience.
Also the editor can “fix up” problems in the story line and the acting.