Dear Chris:
I am glad to receive your letter. You asked me how to learn Chinese well. Give you some advice. I think it's very important to have Chinese classes.
You will find it very helpful. As we know, "use it or lose it." So it is very necessary to practice in groups. More importantly, you can improve your Chinese by watching China movies.
Learning to sing Chinese songs is also a good idea. By doing this, you will learn more Chinese words. If possible, you can even make some friends in China.
They will be happy to help you, which is also a good opportunity for you to learn more about China culture. (method)
Learning is a lifetime journey. Keep practicing every day, and you will bring something new.
Best wishes!
Yours.
David.