Set up

These support pages should get you started with setup of your new iPad - and the methods of transferring your data from a donor iPad/iPhone to a new (or reset) 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 device, 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

You should note that if transferring between dissimilar devices (i.e., iPhone to iPad - or vice versa) only data and a subset of device settings will be transferred from the source to the target device.

How are you doing it?

If it's through Quick Start, that's notorious for hanging and not completing. I tried with barely any data to be transferred and it got stuck several times, where I'd reset the new iPhone each time. I prefer using a Mac, with a backup from the "donor" and where that backup is specified for setting up the new iPhone.