How can I learn English well when I just immigrated to America?

Brother, you know you have a small vocabulary and poor grammar. What do you need to say? Let's go crazy. We are in America. What shortcut do you want? Only slowly but surely. Since you concentrate on learning English, you should study English for eight hours every day. If you have nothing to do, you'd better go out for a walk, such as going shopping and chatting with the salespeople. Go to the square every morning to talk with the exercisers about English. Don't be afraid to make a fool of yourself. We are not locals. Come on, two weeks of basic communication, as long as you work hard.