Unlike some years back when sites were almost exclusively static, the standard these days is to have a feature-rich, dynamic web site. Few people can build such a web site from scratch though, so the most convenient solution to have a dynamic site is to use a script application. A lot of web hosting providers offer script installers which can be used to add this sort of an app for any of your domain or subdomains, so you will not need to add anything manually. The advantage of using an installer tool would be that the scripts are ready to use in just a few minutes and the copy which will be installed is already with the settings necessary for it to run the way it should on the specific hosting server, so you'll not have to modify any script or account settings. That way you can easily create one with only a few clicks even though you may have never had a site before.