This is a massive guide for that can help direct your actors towards building up an improvised character & story. Throwaway the script, follow this guide to developing your character and the elements you are responding to.
This is a comprehensive FAQ about how to make your short film and build momentum towards getting it made. A must read for novice filmmakers.
Every actor started from humble beginnings, in a similar situation to you. But something that ties them together are the self tape audition opportunities that come their way.