Translation of insolent in German

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.
Please give me a minute to work on it, I've currently three people talking to me at the same time over the support chat, plus two others in form of real people in my office! (Yes this still exists, real people...). Is that OK?
It's very good that you can learn English with the help of technology (Internet), I think you'll learn quickly. Although I am now getting better, I feel the improvement. But once again I lack vocabulary.