how do I find out what version my ipad is?

You can look up the model number, which is on the back of the iPad, on this page : Identify your iPad model - Apple Support

Or type in the iPad's serial number (Settings > General > About > Serial Number ; or on the back of the iPad) in on this page : https://selfsolve.apple.com/agreementWarrantyDynamic.do

And for the iOS version that it's on, that's shown in Settings > General > About > Version