1) Yes, create the content areas named as meta-keywords or meta-description
then add the developer notes code for the content areas to the meta tags, for example:
<meta name="keywords" content="<?php echo WA_getCMSContent($database_PowerCMSConnection, $PowerCMSConnection, 'pageName', 'meta-keywords'); ?>" />
<meta name="description" content="<?php echo WA_getCMSContent($database_PowerCMSConnection, $PowerCMSConnection, 'pageName', 'meta-description'); ?>" />
2) when you create a new content group (Click the plus button next to Content) there is a checkbox you can click to use the content area as a template.