The first step to start using Google Analytics is to set it up! It is an amazing tool and it's free to use – so what are you waiting for?
First, set up an account of the Google Tag Manager dashboard and follow the prompts to set up a container. It will give you some code.
Hootsuite said, "This is the piece of code you’ll be pasting into your website’s back end in order to manage your tags. To do that, copy and paste the two snippets of code onto every page of your website. As the instructions say, you’ll need to the first one in the header and the second after the opening of the body."
Then it's time to actually create your Google Analytics account! Follow the prompts there to get your tracking ID.
Then you're off to a good start!