This guide will have lots of useful resources and tips. Use the yellow tabs above to navigate to different types of sources.
If you haven't looked at the Occupational Outlook Handbook yet, check it out. It's produced by the Bureau of Labor Statistics, the government agency that provides all kinds of employment statistics. Importantly for your paper, it includes the major professional associations for each field. Professional associations can be a great source of information for issues and trends facing a particular field.
Hint: Use the Search box in the blue-gray area of the page.
For more unusual careers, check out the Occupational Outlook Quarterly - a magazine produced by the Bureau of Labor Statistics. It contains articles on generally lesser known careers, such as rodeo clown.