How correctly install EpiServer Commerce 7 on MVC Site?

I am trying to install EpiServer Commerce 7. Found this one guide Building EPiServer Templates with MVC Razor Part 1 Can some body explain this first step Create a New EPiServer Project in tutorial? I created new project in Visual Studio then in Development Center of EpiServer I created new site with SQL database, but it created site in another folder wwwroot. How can tie this two projects in one?

From the EPiServer Documentation (http://world.episerver.com/Documentation/Items/Installation-Instructions/Installing-EPiServer-updates/Installing-Commerce/):

1. Download and extract the installation files.
2. Run Setup.
3. Select the products you want to install.
4. In Extension Manager in Visual Studio, install EPiServer CMS extensions.
5. Create a site from VS using EPiServer Web Site, or from EPiServer Deployment Center.
6. In Extension Manager in VS, install NuGet Package Manager.
7. Add "http://nuget.episerver.com/feed/packages.svc/" as EPiServer source.
8. Install EPiServer.CMS.UI for CMS, and EPiServer.Commerce for Commerce.
9. Build your project.