I am a New Egg too! To answer your question about adding to the flock, we are currently finishing up on an additional coop and run that is built out from our existing one. When finished, we will have 5 separate coop areas with their own attached runs.
You might as well start looking into an incubator, as that will be the next stop after the coop addition. Then you will become a hatch-a-holic. It's okay, it's a process we all go through (and the only cure is MORE!)