How to transfer all iPad data to another after set up

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

If the donor iPad, from which you are transferring your data precedes iOS12.4, QuickStart will not be available.

“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:

How to back up your iPhone, iPad and iPod touch – Apple Support

Restore your iPhone, iPad, or iPod touch from a backup - Apple Support

Assuming that you have retained your original iPad - or you still have the iCloud or iTunes backup of the original iPad - you can simply reset your new iPad and begin the process again from the initial “hello” screen:

Settings > General > Transfer or Reset iPad > Erase All Data & Settings

After setup? You don't. You need to erase the new one and start the process over.