The page templates are predefined pages that you can use on your theme. Depending on the theme you’ve bought, the number of templates and layouts possible with each template will differ.
Each page should have a series of Page Meta options which can also alter the style of the template you’re trying to use. Usually the meta options can be found below the default WordPress text editor screen. For more details about page meta options please see this knowledgebase article: Post / Page Meta Options