You do not need to duplicate the header and footer. Keep the ones you have and they will work on the new pages.
While I understand what you want, you need to understand that in Word jargon, "template" means something else. You mean a particular pattern of text, textboxes, tables. That is consistent with the English-language meaning of "template."
In Word jargon, it means a special kind of file that holds things that can include text, textboxes and tables, but more.
When you use "template" in asking about Word, you will get information about Word template files, which is not what you are looking for today.
Templates in Microsoft Word
You could save your content as a Building Block/AutoText.
This could be your page of content or even your eight pages.