Sign Up for Firebase
Login to Firebase with your Google Account. Using the same account as your Google Play developer account is a good Practise.
After logging in you may need to accept some Agreements.
Creating your first project.
If not prompted Select Add Project.
Fill in your App’s name and country.
Accept the T&Cs then click Create Project.
After creating the project you’ll be prompted to add your App details. We go into this in another article here.