Here are some good websites to check out:
The Vocational Information Center - http://www.khake.com/page53.html
This site has lots of links about careers in different fields and about how to be successful in them.
Bureau of Labor Statistics - http://www.bls.gov/oco/ocos027.htm (Engineering); http://www.bls.gov/oco/ocos042.htm (Computer Science); Search for others… This website, published by the U.S. Department of Labor, is the premiere site for career field information; it includes nature of the work, job outlook, and earnings info.
Engineering K12 Center - http://www.engineeringk12.org/students/default.htm
Hosted by the American Society for Engineering Education, this website provides details not only about different engineering careers, but also about what it takes to get there. It is an exciting, easy-to-read website targeted toward K-12 students. Start by exploring the blue links in the top right corner.