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The CareerOneStop website is sponsored by the U. S. Department of Labor and contains excellent information on career choices including mapping military occupational specialties to civilian jobs, identifying the fastest occupational fields and declining occupational fields.
The Occupational Outlook Handbook (online version) provides in-depth information on hundreds of career choices. Instructions on how to use this site are located in the "Ways to use the Occupational Handbook" section on the homepage.
The Bureau of Labor Statistics is where you go to find information on topics such as the number of people employed in a career field or the average wages for a career field. The homepage also has links to other relevant sites such as the Occupational Outlook Quarterly and Occupational Employee Statistics.