Windows 10 SDK came with not templates or guidance at all.
To fill in the gap there is a new open-source toolkit and library:
A community-built, set of Windows XAML/.NET app templates with basic design patterns. It leverages the Template 10 library (in NuGet) to maximize awesomeness and minimize boilerplate garbage. This extension adds two new project templates for Windows apps: Template 10 (Blank) and Template 10 (Minimal)."
Documentation: Home · Windows-XAML/Template10 Wiki
"Want an in-depth look at the Universal Windows Platform (UWP)? Engaging experts Jerry Nixon and Andy Wigley, of the Developer's Guide to Windows 10 Preview, return to show you how Windows capabilities and social integration can help you create amazing experiences on devices running Windows 10, including phones, tablets, PCs, and even (coming soon) Xbox"
Podcast interview with authors: Template 10 - MS Dev Show Podcast