Dear Mr. Wu,
I'm considering joinining your English club and writing this letter to find out how.
My name is Xiang Li. I'm in the first year at XYZ University and will be on an exchange program next year. Therefore I'm looking for places where I can practice and improve my English. I heard your club provides a good learning environment and has many good English speakers to help its members. I am really eager to be one of you.
Please tell me how I can become a member. Is there any entrance requirements? How much membership fee shall we pay, if any? What activities does the club organize for its members? I look forward to find the answers to all these questions from you.
Sincerely yours,
Xiang Li