In an annotated bibliography, all of your citations and works cited follow the normal rules for the style guide your professor chooses (APA, MLA, Chicago/Turabian). The only thing you add is an annotation--your description of each source.
The annotation summarizes the source, and then includes your own evaluation of it. Annotations can be a few sentences, or a few paragraphs. Check with your professor to see what is required for your assignment.