Im not able to see the Agentforce Sales Coach in the Agentforce for Sales in the trailhead Enable Sales Coaching in Agentforce

You are right, there is probably something missing in the module's instructions. I would recommend to log a case with salesforce support. Visit the url and type your question in the search bar. Agentforce will start chat with you. Ask bot log a case for you. It'll ask you to login with a salesforce trailhead org. Provide the details of the issue and bot will log a case for you. Thanks