Transfer
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
Apps are not directly transferred between devices. For Apps, the transfer process creates a record of the Apps that are installed on the donor iPad - and it is this record of installed Apps that is transferred to the target (new) device. For Apps that are still available for download from the App Store, the corresponding Apps are automatically downloaded and installed from the App Store.
Photos and iCloud
Video and Photos are natively saved within your iPad's Photo Library.
While you can enable iCloud Photos to (a) synchronise your Library between devices and (b) access you library from any computer using a web browser - using iCloud Photos does not provide the ability to keep your photos/videos just in iCloud. You must understand that deleting items from your Photo Library will cause the corresponding copy to also be deleted from iCloud Photos. As such, iCloud Photos is not suitable for use as a independent repository for your photos and videos.
Likewise, if using iCloud Photos with your iPad and other Apple devices, deletion of a photo from the device will cause the corresponding photo to be deleted from your iCloud Photo Library and other devices that are synchronised with iCloud. You can selectively disable iCloud photos on specific devices, but in so doing photos will not be automatically synchronised from that device.
While iCloud Photos is not, of itself, suitable for maintaining a device-independent location to store your photos/videos, you can still use your available iCloud storage to save your media. To do so, you will need to export your photos/videos from your Photo Library to a folder that you create in your iCloud file storage - this being external to your iCloud Photo library...
Using the native Files App, create a folder in iCloud - within which you will initially save a copy of your selected photos and videos.
Next, open your Photos App - and from your Library, tap to select the items that you wish to copy to iCloud file storage. When you have selected the items that you wish to copy, tap the Share button (a square with an upward-pointing arrow) at bottom-left of the Library window.
Tapping the Share button will expose an action menu; from the menu select Save to Files - and navigate to the iCloud folder that you have created - then tap Save. Your selected photos/videos will be copied to the folder that you have selected.
Don't try to copy all your photos/videos in one go - as this will be very slow and may fail due to insufficient system resources. Instead, copy across small batches.
When you have finished, check that all your photos are visible using the FilesApp. You should note that photos and videos that are not stored within the Photo Library cannot be accessed or viewed using the Photos App.
When you are happy that you have copied your photos/videos to the intended folder, only then is it safe to delete the original image files from your Photo Library.
