Here is information about Activation Lock and the procedures to unlock your iPad:
https://support.apple.com/en-us/HT201365
https://support.apple.com/en-gb/HT201441
Unless you are the owner of the AppleID that was last used to activate the device, or unless you can secure the cooperation of the previous owner, you’ll not be able to defeat or bypass the Activation Lock. Without documentary evidence that you are the original owner (such as sales receipt showing the serial number), Apple won’t assist.
Sorry, not the news that you were likely hoping for, but your acquired iPad is of no use to you.