Welcome to BYC! Yep, lots of good information here and some very helpful, knowledgeable people to answer any questions you might have.
The "covert" operation might be tricky to pull off unless you have a lot of space between you and neighbors. Chickens aren't the quietest animals, at least not the ones I've been around. Even if you don't have a rooster crowing off/on all day, the hens can make quite a racket. Guess that could vary depending on breed or situation but they do squabble and get excited sometimes. Once they begin laying, a lot of them will "sing" an egg song. And then you have some chickens that are just more talkative than others. Maybe you could buy your closest neighbor's acceptance with eggs if they are bothered by your chickens.
Good luck to you, let us know how your new venture goes!