One of the best resources for finding out more about the legal profession and how much lawyers earn is from the United States Bureau of Labor Statistics. This department of the government tracks information about all professions.  The two links below will let you find out everything you ever wanted to know about becoming a lawyer and how much they earn.

http://www.bls.gov/k12/html/soc_001.htm

http://www.bls.gov/oco/ocos053.htm