(1 & 2)
I want to be a doctor because I like helping people and I like working with health/medicine and its people. And a doctor help people by giving them medicine or telling them what to do with the issue you are having with something.
(3 & 4)
You would need a doctoral or a professional degree is needed to have a doctor job or to apply for a doctor job. You make around $79,801/year depending on how many people you attend to and on what doctor you choose to be or what you want to be.
(5 & 6 & 7)
There are around 190,000 jobs in the U.S for doctors. This job will be more popular by 36% and will have about 258,600 jobs in 2012-2022 because of political demands. Similar jobs like this are economics professor, mathematic professor, and sociology.