When your order ships, you will receive a notification. These get snagged by spam folders sometimes, so be sure to take a peek in there if you believe your order should have already shipped. Tracking numbers are only available for domestic customers -- track your shipment at http://www.ups-mi.net/packageID/.
International customers: the number in your shipment email is only a customs ID number. You will not be able to track your package using this number.