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
As to your choice of iPad, your needs and budget may influence your choice. The iPad Pro models are the highest performance (and most expensive) iPads with the broadest range of features. At the other end of the scale in the iPad8, this being the cheaper entry-level model. In between is the iPad Air - high performance and lightweight. If you need a small screen, you’ll find the iPad mini5.
You can compare models here:
iPad - Compare Models - Apple