Hello Anthony,
This will depend on the version of QuarkXPress that you are currently using. If you are using QuarkXPress 7 or 8, you will be able to type in Urdu using Glyphs, but for accurate rendition (Right to Left) you would need a third party Xtension called ArabicXT.
You may refer to the following webpage:
http://www.layoutltd.com/arabicxt.php
For complete support of Urdu, related fonts and other Xtension specific information, please contact the Xtension vendor.
Please let me know if you need any further information.
Best Regards,
Aditya