Trying to add common template to all future slides created

I am creating a template with college name and other information in header and footer section. I have to reuse the template in all further slide preparation. I am using Microsoft 2007 and would like to know the way to create the reusable template. How to create personal templates? How to set newly created template as default? Presently I am editing the old slides for new presentations to retain the header and footer as is. Is there a professional way of doing it?
