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If you want to package your WinUI application, you could refer to this document: Package and deploy. This document introduces the general ways to package an app using Windows App SDK no matter it is a packaged app or a unpackage app. The common way is to use Visual Studio to package your app. And if your app is an unpackaged app like EXE file or MSI package, you could use the MSIX package tool to package your app.
If you want to publish your app to the store, you will need to register a developer account first: Opening a developer account. Then you could refer to App submissions which shows the process of how to submit an app submission for your MSIX app. And if you want to publish an EXE or MSI app, you could refer to this: Submit your MSI or EXE app to the Microsoft Store.
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