I would like to recommend that your preexisiting coop be thoroughly cleaned and sanitized as well as any used chicken house you get to prevent bugs,germs etc...being transmitted to your new chickens. Also since you live in LA, and a rooster is out of the question,you were choosing some noisy squawking chickens from Meyer Hatchery ie...Spitzhauben,Exchequer Leghorn for example. If I lived in the city, I'd want a calm/ kinda quiet chicken like a Black Sex Link, Barred Rock or Salmon Faverolle. The Black Sex Link is a superb layer and the Barred Rock is a very reliable layer also. The Barred Rocks and Faverolles are very friendly and make excellent pets. I've always bought my chicks from Meyer Hatchery (the last 4.5 years) with no issues and will continue to do so. The only problem I see that you will be having is the same problem that the rest of us have already had: Chickens are addicting and you just cant have a few,you're always wanting to get more!!