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You need an internet connection and an Apple ID to use the App Store.
NB: Charge the battery to at least 70%
The availability of the App Store varies by country or region.
See the Apple Support article Availability of Apple Media Services.
Wondering if you are signed in with your Apple ID on your device.
Seems you may need to sign in to your device before you can use the App Store.
Sign in with your Apple ID - Apple Support
For the first time you use the App Store,
you need a payment method in your Apple ID account, even for free apps.
How to: Change, add, or remove Apple ID payment methods - Apple Support
or
Log in at appleid.apple.com and view / check / update the payment information stored there
Check if settings have a restriction on purchases:
Manage App Store purchases, subscriptions, settings, and restrictions on iPhone – Apple Support
If needed:
App Store Support has a website online.