Gandhi and goose491 had some good info for you as far as training/etc. "Pushing Tin" is crap in the realism aspect. About the only thing that movie got right was some of the phraseology.
I only have about 5 1/2 years experience in the job so far. Got initial training in about 3 months for free thanks to the Air Force. Then there are about 8-12 months of on-the-job training, depending on you, the training, the facility/complexity, etc. I don't know much about training outside of the military, but it is becoming more and more common every day for universities to offer ATC programs.
Selection is as goose491 said. The job isn't for everyone, but if you can work quickly and calmly under pressure you're a good candidate. Stress is one of the perks for me...there's a great deal of job satisfaction when you directly keep thousands of people safe every day.
Burn-out...haven't hit it yet, don't think I will. Environment...I would definitely rather be outside doing something with my hands. Hence my 2 cents on the next issue...career path. Like I said, only over 5 years so far, working on becoming a commercial pilot. Know a few people who've been with the FAA for 20-30 years and LOVE what they do. There are lots of little "quirks" with the job. Physical health/age requirements for one, so it's not likely you'll be actively controlling traffic toward the end of a career like that, but by then you'll be making so much money you won't care about sitting in an office measuring out airspace or on some safety board. More specifically on the pay...say you go the military route for 4 years and get out for a civilian job. At a little contract tower (non-FAA managed), you could expect to start at around 45k/yr. Be proactive in applying for a job you really want, get an FAA job, and expect about 60-70k/yr in a tower, 70-85k in a radar facility, STARTING, and a pretty steep increase as you gain ratings/experience. There are many sites on the internet where you can get more detailed info and also those sites where you input your zip code and search for a job and it tells you the average pay. Let me know if you have any more ?s. - It's not called showing off, it's called you being mad because you can't do it! - We have enough youth, how about a fountain of Smart?