See the instructions in Use Quick Start to transfer data to a new iPhone or iPad - Apple Support
If you already started setting up the new iPad, erase it and start over using the following instructions:
To erase your device that's using iOS or iPadOS 15 or later, tap Settings > General > Transfer or Reset [Device] > Erase All Content and Settings. On iOS or iPadOS 14 or earlier, tap Settings > General > Reset > Erase All Content and Settings. This erases all data on your device. After you erase it, your device restarts and the "Hello" screen appears.