You are a new recruit and your commander wants you to listen to him since he is the more experience guy. He would teach you anything that you would need to know. And that is what you need to do, at least for now as you would be going to war soon. You are a soldier in this game and you need to kill your enemies. Don't worry about the start since it is just for practice and you won't deal with real enemies till the next mission. From then on, you would feel the pressure as the game would be harder and harder.