The editors of The Chicago Manual of Style provide a website to support use of their style guide. Although the actual text of the manual online can be seen only by subscribers, a Chicago-Style Citation Quick Guide on constructing some of the most often used types of citations is provided for free.
Purdue University's Online Writing Lab [OWL] makes a more detailed guide to Chicago style available on their website.
Since the Rhode island College History Department uses the Chicago bibliographic citation style in a modified way, the final arbiter of correct usage is your professor.
The Chicago Manual of Style was not created to support the needs of historians specifically. And so, though it is hundreds of pages long, there are still some unusual items, especially primary sources, which Chicago may not address thoroughly or at all. Consider consulting Evidence explained : citing history sources from artifacts to cyberspace by Elizabeth Shown Mills in the Adams Library Reference Collection: Ref D5 .M55 2007 for examples of sources such as cemetery records, voter rolls, deeds, etc.