Pro tip: when people say "build a network," they really mean "make friends in your and related industries." Like, actual friends: people you go out for drinks with and enjoy talking to. The trust you build, as friends, will lead to work.

Normally you meet these people in unexpected ways. Just today I was offered a potential job from a girl I met while auditioning apartments. I've also gotten jobs from people I've met on dating websites, on the train at 2am coming home from a party, and on unrelated online forums.

Leave the house, keep an open mind, be friendly.