Virtually all individual newspapers and broadcast media have websites. But how much content they allow varies greatly. For instance, New York Times used to allow free access back to 1996, but April 2011 they started charging after 10 articles/month. The Seattle Times used to be free, but now is subscription-based. Sigh...
Hopefully the news organization you will be working for has purchased access to LexisNexis and other databases for news articles. Large news organizations will also have their own digital and/or print archive, or morgue, of their prior stories.
Want to brush up on a topic by watching/listening to a video?