Miss Gellott Suggestions
If you want to familiarize yourself with the playwriting format/style/genre, Miss Gellott highly suggests the following book by David Ives: All in the Timing - Fourteen Plays.
IMPORTANT: Remember, if you want your play to be considered for performance in the Winter One Acts, your manuscript needs to be received by Miss Gellott no later than 10/31 of that year. Good luck!