Dear Simon
Thanks a lot for your letter.I am happy to be your penfriend.Here are some things about myseIf.
i am john(填写名字）
my parents and i live in guangzhou,China.
i study at railway middle school(铁路中学,要求放中学的名字可以放你自己的).i live near the school.
here is a photo of me and i am looking forward to receive more letters of you so that i can get the chance to know you better.
best wishes.
yours sincerely
john