Hi there!
Here is a link containing a small and rough sample of application using WPF. I have created just for show how to add objects and interact with them.
http://forums.arcgis.com/threads/15509-Drawing-TacticalGraphics-using-the-API-for-WPF
Anyway, if you are a beginner using C#/WPF, I think that it would be *very* hard for you to develop.
Cheers
Mario