Start off by creating a new project in Visual Studio 2017. Under Visual C#, select the .NET Core node and click on the ASP.NET Core Web Application.... Click on OK:
You will then be presented with the project template selection. You can choose to create an empty application, a Web API (allows you to create an HTTP-based API), or a full Web Application. Select the Empty template, make sure that Host in the cloud is unchecked, and and click on OK: