Who and how much to tip at the salon?

I am not a salon regular so the tipping issue isn't clear to me. In fact, the last time I got a real hair cut was nearly 15 years ago by my Mom's best friend who had hands like a butcher; hence, my reluctantcy to go anywhere near shears again. (I just cut it myself here and there or had my sister trim it.) So I finally went to get my hair straightened - one of those pricey thermal reconditioning treatments - and I noticed another customer in the salon went over and tipped the woman who washed her hair (I think she just had a cut and style). I had 3-4 people work on my hair throughout the time I was there, not including the woman who washed it. In fact, I also had someone bring me iced coffee, fluff my back pillow, and bring me magazines. Was I supposed to go and hand a tip to each person who worked on my hair at the end? I just gave the main lady with whom I made the appointment and who is also the salon owner one of those small envelopes with a tip and figured she would distribute it to her assistants who helped her. It was a generous tip but I walked out feeling totally stupid. I hope that they aren't in the back room laughing at me or have a wanted poster up of me. What is the etiquette on tipping in salons in New York?