How do I set up my 2025 iPad Pro M4?

Have a look at the iPad User Guide:

Turn on and set up iPad - Apple Support

If you do not use the latest backup, you can set it up manually.

Before you do, have a look at this article, in case you think about changing the Apple Account password for all of your devices before you start.

If you think your Apple Account has been compromised - Apple Support

What causes you to suspect that your iPhone has been "hacked" or otherwise compromised?

These support pages should get you started with setup of your new iPad - and the methods of transferring your data from your iPhone (if required) to your 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:

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 device - and it is this record of installed Apps that is transferred to the target (new) device. For Apps that are compatible and available for download from the App Store, the corresponding Apps are automatically downloaded and installed from the App Store.

If you need assistance, you can make an appointment for the Genius Bar of your local Apple Store or Apple Authorised Service Provider (AASP) here:

Genius Bar Reservation and Apple Support Options - Apple