Mages aren't known for twinking at Level 19, but after you get killed by one you will hope no one saw you.
For a guide to gearing a Mage twink refer to the Cloth twink gear guide.
External links Edit
PwnDepot.com An archive of World of Warcraft Twink Guides and Information Read-only mode as of Oct 02, 2009
Twink Info World of Warcraft Twinking Blog - Twink Smarter