You don’t need a tutorial or training with it. It’s meant for Google to do the heavy lifting. You just sign up and get verified. Should be really easy, nothing to worry about. Only thing you have to be careful about is what you say to potential leads. If they are not a good fit, you have to make that abundantly clear on the call otherwise Google will charge you for the lead anyway. If you explicitly say that you can’t help them or you don’t offer that service, Google is obligated to refund you for that leads.