In order to publish an app in the Apple App Store, you need an Apple ID as a first step, which gives you access to both the Apple Developer Portal and AppstoreConnect. The Apple ID is always an e-mail address with which you register.
Users of an iOS device such as an iPhone or iPad usually use the Apple ID to manage their app and in-app purchases. Users of other operating systems can also create an Apple ID.
Apple ID registration: a valid email address, date of birth and phone number. Optionally, payment information (credit card) can be stored.
1. Register at Apple
Open this link from Apple: LINK
Fill out the form to complete the registration.
If you have successfully completed the registration process or if an Apple ID already exists, you can continue with step 02 - Create Apple Developer Account.