ALL CAPS for character names is fine throughout plays, but just use them once in screenplays.
QandA
Drafts and revisions
Expect to do multiple drafts and revisions and make sure the first draft you show people could actually be shot.
Agency papers
When you sign with an agent, know what you’re signing and how to protect yourself.
Do I have to write the courtroom scene?
Sorry, you can’t outsource the hard stuff to the actors and director.