Thinking of writing my own play

I'm thinking of writing my own play.

I'm somewhat inspired by the PS2 commercial and short film The Wolf Man by Tim Hope, of which I saw for the first time a week or so ago. It's been a constant figure in my mind and has given me a somewhat clear picture of how and what I would want it to be.

The only thing is I've never written a play before, nor have I ever really....watched or seen one as far as I can remember.