I'm going to disagree with georgespencer -- not with his perfectly reasonable suggestions, but with the premise that it's not worth seeking out a mentor. On the face of it, nobody "needs" a mentor, but the entire idea behind a mentor is face-to-face networking and advice. In addition, you will be borrowing your mentor's bona fides when you're having lunch with connections you've made via your mentor, and this can go a long way. A friend of mine has Gary Reiner for a mentor -- having that kind of horsepower behind your idea is priceless.

Having said all this, your best bet is to network and seek out introductions. You can't come in "cold", but "lukewarm" is okay, as long as there's a personal connection of some kind to your mentor -- whether it's a shared vision or a shared connection.

ETA: clarity.