Playwright in search of an agent

I have written a play that had a very limited run in a regional theater. Of course, I'm convinced that it's great, and I'm trying to find the play a home for a longer run. I'm completely new to this world, and I don't know exactly how to proceed. I'm sending the play to theaters that accept unsolicited submissions as well as play competitions. But I've also been told to try to find an agent. Can anyone direct me to a website/data base of agents who accept submissions from unknown playwrights who have moxie and a dream but no experience or corrections? Many thanks.