Listen, you can't learn boxing by yourself. You need to go to a boxing gym, and hook up with a decent trainer. Otherwise you're not going to make any progress and you're going to develop had habits. Go to a gym, train hard, and any maybe later when you actual experience under your belt, you can invite your friend to the gym. If he's really been boxing for years, then you can plan on sparring each other. You learn boxing in the the gym, there's no way around it.