Have a look at my tutorial, it should be full proof ;-) as far as basics go:
http://www.codeproject.com/Articles/483507/AvalonDock-2-0-Tutorial-Part-1-Adding-a-Tool-Windo
http://www.codeproject.com/Articles/483507/AvalonDock-2-0-Tutorial-Part-1-Adding-a-Tool-Windo