First of all, there are a lot of threads that discuss this in great detail so you should really do a search for this topic - you'll probably find most of the info you want is already posted here. That said, if you have to pee or go to the fridge and get a snack do it know because I'm about to go off on one of my patented long-winded posts.
Becoming a Muppeteer (or any kind of professional puppeteer) is a very long, hard process. Alot of fun, but a lot of work too. To apply to work for the Muppets you send a videotape to them in New York. Kevin Clash or one of the other puppeteers review the tapes when they are looking for new talent. It's a good idea to get a basic amount of training in puppetry and practice a lot before doing this. You don't have to be in a rush to do it if you re still in high school as they only hold workshops once every few years.
The workshops last for a week and they eliminate candidates day-by-day until there are only a couple left. The lucky few who make it through to the end may get the opportunity to observe or maybe lend a hand here and there on something like Sesame Street. If you're good and everyone likes you that could last a few years until you become a regular
background puppeteer, working whenever there is a big crowd scene and that sort of thing (probably not too many episodes of Sesame because of budget restrictions). At this point remember that it's unlikely you'd even have a minor recurring character. You also have to eek out a living, and most puppeteers are like working actors - they usually need more than one or two sources of income.
Most of the Sesame Street puppeteers did the show for around ten years before they got a major character and even then they are freelancers, most of whom are not employed full-time. Bill Baretta (who I don't think does Sesame) was an exception, he rose through the Muppet ranks very quickly, likely because he learned a lot quickly while working on Dinosaurs (he was the body performer for Earl Sinclair) and because he just happens to be an exceptionally phenomenal performer.
I don't want to discourage you or sound negative, but it is good to know from the outset that it is a hard business to succeed in. In the few years I have been in puppetry I have seen alot of people who started off really gun-ho drop out of it or put puppetry on the backburner because they didn't succeed as quickly as they had hoped.
It's also very important to remember that very few of the puppeteers in the world work for the Muppets. Even fewer ever become principal puppeteers with them (about one person per decade it seems). Remember how good I said Bill Baretta is? That's the kind of talent (or at least potential) you need to really make it with the Muppets. But you can still have a great career as a puppeteer and not work for the Muppets too. I don't think I've really "made it" by any stretch of the imagination but yet I've more or less made my living in puppetry for the past seven years.
There's a few puppetry schools in North America you could attend (check out the list on
The Puppetry Homepage). There are also some Web sites with info that might help you. Many of the Muppet performers recall their audition experiences in the
interviews section of Muppet Central. Muppeteer Rick Lyon also has a great article for aspiring puppeteers
here and part-time Muppeteer Leo Brodie has written two great articles on TV puppetry technique for beginners,
Introduction to Video Puppetry and
How to set-up a practice monitor.
I hope this helps!
