You can't track it unless it has a connection to the internet. Without cellular service or wifi all you can do is physically look for it or try calling your number to see if someone answers. Neither are probably going to work if it was stolen. Put it in lost mode and change your passwords, including your iCloud password so the theif doesn't erase your data and take over your account.
Also read this: http://support.apple.com/kb/HT5668.