I know that most blog platforms create feeds automatically, but if you have a static website you'll need to create one manually. And I would recommend to use some type of software unless you like writing XML by hand. For example, you can use this resource www.feedforall.com. This service has an easy-to-use builder that lets you create and manage all your feeds in one place.And then once you've created your feed you have to upload the XML file to your web server.