You should think first about the layout of the accordion. If you use tt_content elements, only the header and the bodytext will be displayed. If you use pages and tt_content elements, then the page title will be displayed first. After clicking at the page title, you will see the content elements of that page. If you use tt_news, the categories are displayed first. After clicking at a category, all news-titles are shown. Than you can click at a news-title.
Put your content elements to a folder and select that folder in the plugin.
You can change the layout of the result. See chapter “Administration”.