The information you’ve reference really pertains to RhinoScript and Rhino.Python.
Here is my modified three step process:
1.) Build your RhinoCommon-referenced plug-in using Visual Studio. The results will be a .RHP assembly.
2.) If you want a Toolbar collection that provides an user interface for your plug-in, use Rhino’s Toolbar command, as I’ve mentioned above. This will produce a .RUI file.
3.) When you are ready to distribute your plug-in and toolbar collection, you have several options. You could write your own MSI installer using one of the many free or commercial installer creation tools, such as Wise, InstallShield, Wix, etc… Or you can use our simple plug-in installer technology called the Rhino Installer Engine.
http://wiki.mcneel.com/developer/rhinoinstallerengine/overview
Information about how to create Rhino toolbar collections is found in the Rhino help file. Also, you can learn a lot about creating toolbars by exploring the toolbars included with Rhino.