To purchase and download from the iTunes Store, you need an Apple ID. If you've used other Apple services such as iCloud, the Mac App Store, or have purchased from the Apple Online Store, you can sign in to the iTunes Store using that same Apple ID.

Before you create a new Apple ID, find out if you already have one. If you don't have an Apple ID, you can create one before you can start using the iTunes Store. 

Create an Apple ID on a computer.

Create an Apple ID on an iPhone, iPad, or iPod Touch.