Module is integrated in Sitefinity modules section as an assembly. This means that in order to create your own module you need to create a new C# project (Class library). The core class in this module you will name any way that you find suitable (for example : ListModule, MyModule…), but the important thing here is that this class needs to inherit Telerik.WebModule class.
In order to appear on the modules page and be usable, module needs to be registered in the web.config file.
The resulting .dll file you will obviously put in the bin folder of your website.
The ...