One possible version：
Dear Jane,
I am happy to know that you are beginning to learn Chinese. It’s true that Chinese is not easy to learn, but there is no need to feel worried. I will give you some advice.
According to some language experts, it’s important that you choose a teacher who can speak very good Chinese. He should be able to teach you how to pronounce and write Chinese correctly. That is, you must pay attention to your pronunciation and writing.
In my opinion you can make friends with some Chinese students so that you can provide yourself with more chances to speak Chinese. What’s more, it’s always helpful to see some Chinese films and watch more Chinese TV programmes. Also, listening to Chinese songs will help you to learn Chinese more quickly. Most importantly you should believe in yourself.
Hope you will be getting on well with it.
Yours,
Li Hua
略