How do I copy all of my files from my old iPad Pro to my new iPad Pro
How do I copy all of my files from a second generation iPad Pro to my fourth generation iPad Pro
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These support pages should get you started with setup of your new iPad - and the methods of transferring your data from old to new iPad:
Set up your iPhone, iPad or iPod touch – Apple Support
Transfer data from your previous iOS device to your new iPhone, iPad, or iPod touch - Apple Support
Use Quick Start to transfer data to a new iPhone, iPad or iPod touch – Apple Support
“Transfer” is rather a misnomer. In reality, your data and setup is merely cloned to the new device. Nothing is moved or removed from the original device.
An alternative is to restore either an iCloud or iTunes backup to the new device:
Restore your iPhone, iPad, or iPod touch from a backup - Apple Support