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.
If a transfer between devices was interrupted, the easiest solution is the reset the new iPad - and simply start again.
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