Thank you for writing.
What I can suggest in order to get familiar with our controls is to download and install our Trial version and open the Demo application located in the Telerik folder in Start Menu. This application contains demos of most of our controls - over 250 demos, including their source code.
In regards to your question about RadDock, most of our controls have a Getting started article, which demosntrates how to start with the control at hand. Here is the Getting started article for RadDock: http://www.telerik.com/help/winforms/dock-getting-started.html
I hope that you find this information useful. Let us know if you have any other questions.
All the best,
the Telerik team