Hi Ielliott96,
Welcome to the Apple Community. Congratulations on the new MacBook Pro !
We are all Apple users, like yourself, doing what we can to help each other troubleshoot.
Your Apple ID is the ONE account you use to access Apple services like the App Store, Apple Music, iCloud, iMessage, FaceTime, and more.
It includes the email address and password you use to sign in to your Apple ID as well as the contact, payment, and security details you use across Apple services.
If you wish, click the link to see Apple's support erticle:
How to create your Apple ID if you do not have one::
https://support.apple.com/en-au/HT204316
Or
If you have established an Apple ID for other Macs / devices:
When you log-in (on your new device) to your Apple ID online at https://appleid.apple.com/
Your device is automatically added to your Apple ID.
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Your Apple ID would be used to Log-in to the App Store and Apple Music / iTunes.
First time use of these services requires a payment method to be added to your Apple ID.
Seems this is required, even if you are only downloading free apps.
Payment methods that you can use with your Apple ID:
https://support.apple.com/en-au/apple-id
How to Change, Add or Remove Apple ID Payment methods
https://support.apple.com/en-us/HT201266
(Once you have logged in and used the App Store / Apple Music (iTunes) you can remove the payment method if you wish)
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As well as for logging-in to your MacBook, your MacBook password / admin iog-in / is used to allow you to un-lock and make any changes in the System preferences settings.
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For more info:
Apple ID Support Page:
https://support.apple.com/en-au/apple-id
And, if needed:
There is a "Get Support" link to Apple at top right on this discussion page.:
OR
You might want to contact Apple by phone for support and service:
See a list of Apple phone numbers around the world:
https://support.apple.com/en-us/HT201232
Hope this helps :-)