How To Include Page Numbers On All Pages

Hi,

I am trying to add page numbers to all the my documents. Is there a way to create a stamp that uses a variable value similar to the Date/Time/User Name stamp?

If there is another way to add page numbers to all pages I am open to that as well, my main concern is printing PDFs that have no page numbers but many pages.

Is there a way to create a custom stamp? Where are these stamp settings located? Is this stamp generated by the printer or on my computer prior to printing and if the latter is true can I create a stamp that reflects the current page number?