The 404 (page not found) error message on the front page of your blog appeared because you deleted the placeholder Hello World post. http://en.support.wordpress.com/not-found/ As soon as you publish a post, not a page it will disappear. http://en.support.wordpress.com/post-vs-page/
You change the visibility of the whole blog to private here > Settings > Reading and then return there and change that settings to public when you are ready. to http://en.support.wordpress.com/settings/privacy-settings/
You don’t need to wait for Staff to do this. You can delete the content and retain the URL and start fresh.
bulk delete images & media http://en.support.wordpress.com/media/deleting-files/#bulk-deletion
bulk delete posts > http://en.support.wordpress.com/posts/edit-posts-screen/#bulk-edit
bulk delete pages > http://en.support.wordpress.com/pages/edit-pages-screen/#bulk-edit
Here’s how to permanently delete Trash >
This tutorial will help with starting over http://learn.wordpress.com
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