As far as "Discipline" goes, I was raised by a WONDERFUL Nanny who used the 3 Strike rule with me: 1) I warn you. 2) I warn you again, AND you lose something (i.e., toy, dessert...etc.) 3) Since you didn't get it in the "EAR" (you didn't listen) now you get it on "THE REAR"!
I was a "nanny" (though we didn't call it that) for two years when I was in college. The little girl was just about to turn 4 when I started, and was almost 6 when she was the flower girl at Paul's and my wedding. She was a very smart child, and knew the rules. Her bedtime routine always consisted of two stories and three songs. If she was naughty, I'd cancel one story, then the second, and so on ... She valued her stories/songs so much that she was never bad enough to jeapordize them TOOO badly. I remember only one day that she got NO stories, but she was never naughty enough for no stories AND no songs!