Link your project ID and go through the initial setup guide.
Something to note: you can create a project in the Unity Dashboard, so be sure to check if you have an existing Unity project ID if not then you can create project ID in the editor under Services General Settings.
Please refer to the documentation on initial setup, as this is where you will find instructions on recording events using the AnalyticsSDK.
You will find a newPlayer event in the in your Event Browser on your Dashboard > Analytics > Event Browser.