This document provides an overview of building a first Windows Phone app. It outlines setting up the development environment with Visual Studio 2012 Express for Windows Phone and the Windows Phone SDK 8. It then covers understanding the basic concepts like the programming model, project structure, and application/page lifecycles. It demonstrates a "Hello, World!" app and panorama app. Finally, it discusses building and publishing the app, including tiles, icons, and publishing to the Windows Phone Dev Center.