Hi Iphone12novice,
Thanks for posting to Apple Support Communities. We understand that you have some questions about charging your iPhone 12.
If you have a thick case, this would need to be removed for charging with your MagSafe Charger. A MagSafe case can be left in place during charging. Further details can be found in How to use your MagSafe Charger with iPhone 12 models.
We didn't find charging docks that would charge both the iPhone and AirPods on the Apple website, but you may be able to find third-party chargers that would offer this function. Check out the options on Apple's website from Power & Cables.
We hope that helps!