Following Blake's advice, and understanding that you are new to this, copy a one page Esri sample HTML page to the server's C:\inetpub\wwwroot directory. Then you should be able to access it using your server's name and the name of the HTML page as he stated.
One example, which is close to the example you want to get to might be: Scenelayerview Query Stats
I wouldn't leave things directly in wwwroot as they tend to pile up. My current MO is to put the project in a folder on the another drive and then make a new 'application' in IIS that points to it. My guess is that there's someone else managing your server so this will make a lot more sense to them.
Also, this will provide you with an application that's exposed as 'anonymous', meaning anyone can access it. You probably don't want to get into setting anything different in IIS, but if you start adding feature services that aren't shared to the world you will start to see login credentials needed. Just an FYI.
Once you have a folder that you can access to put your project file(s) in, you can customize it by going back to the Raluca Nicola example and gathering up the default HTML page and accompanying Javascript files. Put the Javascript files in directory and access them from your HTML page. You might be able to figure out what functonality you want from them and just put it into the single web page example I mentioned above, but that all depends on you.
If it was me, at this point, I would start a Visual Studio project for a 1 page HTML app and start to build out the Nicola sample. Then you can upload it to the location you set up for the 1 page test sample and others can see your changes as well (when you publish that is).