Creating a new package and adding it ot nuget source in Visual Studio

I have a Asp.Net MVC solution, that needs to be added as a Nuget package, which can be used as a shared component by internal applications.

I have googled a bit and found that we can create a nuget package only by using a class library. project.In my case how can I create a nuget package using a web application ? Or should I create a class library project referencing the the Asp.Net MVC application dll ?

Previously this whole application as a dll was referenced by other components/ projects. Now I need to move this dll to the nuget source so that it can be still used by other projects by downloading it from nuget manager.

Thanks in advance.