Even if you can use images for free, most images require that you credit the copyright holder or the website where you got the image from. Here are some sites to get you started:
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Copyright is a form of protection provided by the laws of the United States (title 17, U.S.Code) to the authors of “original works of authorship,” including literary, dramatic, musical, artistic, and certain other intellectual works. This protection is available to both published and unpublished works.
from US Copyright Office "Copyright Basics"
Check out this 10 minute video that covers copyright basics and Fair Use - made entirely with Disney clips!
Tales from the Public Domain: BOUND BY LAW?
A great and funny interpretation of public domain laws for artists and filmmakers - written as a comic book! Produced by Duke University's Center for the Study of the Public Domain, you can read the digital version for free and learn more than you wanted to know about copyright and the public domain.