I also tell students that their characters must sound different. They will go to great lengths describing different characters who all look different, but who sound the same. Cover the name of the character. Louis E. Catron refers to this as a credo. And new playwrights don't fully appreciate how much hard work is involved.
Writing is the first step, and then there's rewriting.
It usually takes at least two years to get a script from inception to publication. It's not something that happens just like that. Copyright 1999 Anna Olswanger. All rights reserved.