Attempt to return this iPad and get your money back!
You will never, ever get this iPad to work for you.
No one here can help you. Apple WILL NOT help you!
Without the previous owner's info, you will never defeat the activation lock.
If you must purchased used devices from unknown sources, you must ask
more questions of the iOS device sellerr.
Ask for more photo/images, ask if the iPad has user/iCloud activation lock and ask for photos/images/short video
proof that such an iPad has been reset factory settings and shown proof of the iOS device's start up screen showing the animated, moving, multi-language “Hello” Welcome to iPad screen.
DO NOT just take the seller's “word“ for it! Ask for actual, visual proof!
If the iOS device seller is unwilling to do all of this, pass on the iOS device and look at other iOS device sellers.
Sorry.