What Speedzilla said. Except on a four-suck, er four-stroke, motor I'd change the oil after the first ride, then again later.
Let it get up to temperature before putting it under a load. (This is true always.) Don't rev it in neutral. Don't let it get warm/hot. Don't lug it. (I understand lugging it is worse than revving it.) Give it light loads, like accelerating up a slight incline. Light loads probably means no passenger. The best part about break-in for a street bike is that a twisty road is the perfect place for it.
That's just the motor. You wanna know how to break in tires and brake pads, too? :o