how do i transfer from iPad2 to new iPad pro

If you want to copy all content over to your new iPad see this page : Transfer content from your previous iOS device to your new iPhone, iPad, or iPod touch - Apple Support

Using a computer's iTunes to do it is likely to be better than using the cloud, an iCloud restore onto a new device will only copy over what it can (so won't include your own music from the Music app, photos synced to the Photos app from a computer, and won't be able to redownload any purchases that are no longer in the store)