Each Content Type has a Title and Body Field by default. You can add new Fields and Widgets to all the pages that are created for each Content Type. Fields can contain Text Boxes, Popup Menus's, Check Boxes, Radio Buttons and Images etc. You can add and reorder on the Fields for any Content Type.
You should decide what extra fields will be necessary for each of your content types. Each field is a container for the information that will be stored on every page of a particular Content Type.