How to tell if XML Sitemap is correct?
To make sure you have the content types that you want in your sitemap, you can enable xmlsitemap_node.  After enabling, visit each content types configuration page and select "Include" under the xmlsitemap tab.

After setting each content type, you can check the Included/Excluded status for all content types under the xmlsitemap module config page.

Once that is complete, you can run cron manually to regenerate the sitemap links.  Check www.yoursite.com/sitemap.xml to view the newly generated sitemap.