I have a good friend who is a mechanical engineer...he always tells me that the break in and warm up stuff that's being passed down still is no longer valid.
From mile 1 just drive it. As long as the engine is warmed to normal operating temp before you romp on it you'll be fine. What you don't want is a very fast increase/change in temperature. That's it. Sitting in idle isn't necessary, just drive it easy as folks have said.