The U.S. Department of Labor's Bureau of Labor Statistics publishes the Occupational Outlook Handbook every two years. Consulting this resource to evaluate a potential career path can tell you: What they do...Work environment...How to become one...Pay...Job outlook...Similar jobs...More Info, which includes links to professional resources, i.e. industry associations. Every page has a "suggested citation" at the bottom.
Local Job Projections
These websites can help you find local job projections for your chosen profession.