My iPad was stilen and I’m trying to locate by ein number how do I do that?

Your lost device cannot be located via its IMEI or serial number.

Locate a device in Find My on iPad - Apple Support

Here is Apple’s advice for lost or stolen devices:

If your iPhone, iPad or iPod touch is lost or stolen – Apple Support

Use the Find My app to locate a lost or stolen device – Apple Support

If the Find My iPad feature was enabled prior to it being “misplaced”, then if active, you would stand a good chance of locating it. 

However, if the feature was not activated prior to being misplaced - or the iPad has been inactive for more than 24 hours, the last known location will not be available - and the opportunity to use technical means to recover the iPad may have been lost.

no, this is what you can do

If your iPhone or iPad is lost or stolen - Apple Support

if it's a cellular ipad then in theory the police can with the number get a warrant to force carriers to cellular triangle location get a rough estimate of it's location, it's a costly thing they usually only use it in case of missing persons