There is no concept of headers, footers and pages in HTML. Thus, there is none in RadEditor. The suggestions Rumen provided in his first post in this thread are still relevant and apply.
If Ianko's suggestion of directly modifying the HTML does not work for you, and if it applies to your case, you can consider adding headers and footers programmatically to content you export from the editor to DOCX: http://www.telerik.com/help/aspnet-ajax/editor-export-to-docx-and-rtf.html#modifying-exported-content. If you choose this approach I advise upgrading to the latest version (Q1 2015 BETA at the moment).
As for applying CSS to the content - media queries (e.g., for printed media) are not something RadEditor can create for you and they also cannot insert content, they can only style existing content so it is printer-friendly.
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