Lost ipad

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 have been lost.

If your iPad was not a cellular version then it isn't going to show until the next time it gets WiFi and can update its information. If the battery is dead, it won't be able to update the information either. If you lost it at home or somewhere that it has WiFi and the battery is not dead, you can always have it play a sound and it will when it gets the command by getting a connection to the Internet again. If it doesn't have a connection to the Internet then it isn't going to be able to tell you anything about its location.