Getting started with Sass can be a bit confusing. Besides learning the language itself, creating a consistent workflow with a precompiled language offers it's own challenges.
If you are looking for a super simple way to start writing and compiling Sass, let me introduce you to Prepros.
Prepros is a free desktop application that will monitor your project folder, and automatically compile your Sass into CSS for you, without having to write anything into the command line.
It has many other features and benefits, but for getting started with Sass specifically, I made a quick video walking through how to get started.