Question are there any special requirements needed to do ballet?and how much can one earn by doing ballet?and how long is ballet training and where can you train?
Answer Anyone can start ballet! It helps to be musical, graceful, and slightly flexible, but don't let a lack of any of these things stop you! If you are training to be a professional most people start at a young age. 9 years old is typical. They then take class every day until reaching 17 or 18. However, if you want to do ballet for recreation only you can take class whenever you want! For good training look into schools with a training method, like Vaganova. You will see progression instantly in these schools. Have fun with your classes, and please ask me any more questions you need to!
I can answer lots about ballet, specifically the Vaganova syllabus. I'm still training, but both my parents were professional dancers, so most answers will be coming from them, not me. :) They're the experts. Obviously, questions about difficult technique, etc, would be better answered with someone else, but if you're just becoming interested in dancing, or are having problems with basic steps, like pirouettes or plies, then I may be able to help
Experience
I've seen ballet since the age of 0, because of my parents, and I am training to become a professional dancer now.