Tools of the Trade
Theater (the performance space)
Theatre (the performance concept)
A play or musical
An actor for every role
A replacement actor for every role "just in case"
An ascot, scarf, beret, or other defining clothing accessory
Moleskin notebook and a pen
Patience
Gentle authority
A thick skin
MTA subway pass*
*If you live in New York. And face it: at some point, you'll live in New York.