Here are a few tips and tricks to help become a better Film Producer these rules I'm about to tell you are mainly for someone aiming to produce a horror film but you can use them for any other genre if you wish.
Have Confidence in your script if you lack confidence in your script then you probably will lack confidence in your movie this will cause it to look poor.
Have a Gripping story line A horror film with out a gripping story line will cause your intended audience to loose interest and submit bad reviews about your film the more bad reviews you have the less likely anyone will buy your film.
Be Creative if your film is to similar to other films people will be less likely to watch so be creative and try something new and leave your mark.
Research is a key aspect for someone who is producing a film it enables them to find out from the public exactly what they want and don't want in a film.
And Finally just enjoy yourself :)