What does a successful playscript contain?

What does a successful playscript contain?
Stage directions for:
Lighting and props
I included this.
I will include
this next time.
Stage directions are always in brackets.
Stage directions, dialogue and character names
all start with a capital letter.
Narrator used to give the audience information.
No use of ‘said XXXX’.
No speech marks.
Characters names down left hand side.
What will your playscript be
about next time?
How could you have made you
playscript better?
Do you prefer writing playscripts
or performing them?
How did you make your
performance a successful one?
How did you feel when you had to
perform in front of an audience?