Batman comics: Where to begin? Which is the best series to start with?

I wnat to start reading Batman comics again after flirting with them a decade ago, when I was a kid, but I don’t know where to begin. There are so many series now, I can’t figure out which is which, or even which series are canonical and which ones aren’t. Is there one “definitive” Batman book/series I should start reading? Which are the good ones?