Actually there are video tutorials here on Channel 9 at http://channel9.msdn.com/windowsphone.

(The "Windows Phone 7 Development for Absolute Beginners" series is also mainly relevant for WP8 development, too).

I was already familiar with C#, but hadn't used XAML when I created my first WP app, and I learned quite easily following video tutorials here in C9.

Herbie