Posts » Schedule a Post http://en.support.wordpress.com/posts/schedule-a-post/
NOTE: Scheduled Posts do not actually publish until the first visitor clicks into the site. That click in triggers publication of the scheduled post.
Posts and Pages are not the same. Pages don't have RSS feeds only Posts do. http://en.support.wordpress.com/post-vs-page/
Frankly it makes no sense to publish 70 pages. Pages are for static content that rarely, if ever, changes. What makes sense is publishing Posts and there is no automatic way to move content from Pages to Posts. It's a copy and paste job to move the content into posts.
A WordPress blog can either be structured as a page based website or its conventional post based structure can be retained. That’s why understanding the differences between posts and pages, comprehending the SEO implications of creating a page based structure, and knowing how to use custom menus are key to decision making when selecting a theme, and setting up your WordPress.com blog.
There are many common errors, misunderstandings and misconceptions when creating custom menus and you can read about them here > http://wpbtips.wordpress.com/2011/12/19/custom-menus/