Translation of Nutzung

I try to learn English as much as possible so that I can travel next year to the United States. I would agree to your proposal but I also need to find good teachers. My goal is quality and speed.
Thank you for your email! A little question about yourself. How old are you? I think the Americans are using the word color and not colour, but I understand if you are not sure about it.
I come from Bavaria and live in Munich. How are you? Sorry that I am replying your email just now, but again I am covered with work. My boss is back from vacation and gives me many assignments.