You can also enter the metadata info in Photoshop (not sure about Elements). With the image open go to File> File info and click on Description tag, fill out the form and then click on the IPTC and do the same.
Here is a site that will list all the IPTC CODES:
http://xml.coverpages.org/NITF30-subject-codes.html
And here is a list of COUNTRY CODES:
http://www.unc.edu/~rowlett/units/codes/country.htm
These are helpful when filling out the form.
Remember to inform your purchaser that IPTC data is attached to each file.
Good luck.