Apple does not block or track stolen iPads.
Immediately change all your passwords.
Contact your wireless service provider to block the sim
and to blacklist the iPad if they provide that service.
Report the theft to your local police and your insurance
company (if covered).
Be advised it is not wise to publish your serial number or
your email in an open forum - I have asked the hosts to
delete that information.
Report to police along with serial number. Change all your passwords.
These links may be helpful.
How to Track and Report Stolen iPad
Reporting a lost or stolen Apple product
Report Stolen iPad Tips and iPad Theft Prevention
How to recover a lost or stolen iPad
How to Find a Stolen iPad
Apple Product Lost or Stolen
Oops! iForgot My New iPad On the Plane; Now What?
If you don't know your lost/stolen iPad's serial number, use the instructions below. The S/N is also on the iPad's box.
How to Find Your iPad Serial Number
iOS: How to find the serial number, IMEI, MEID, CDN, and ICCID number