Format, I think it should be similar to writing a normal letter format. Dear XXXX, I am a fan from XXX. . . . . . . . . (Omit the back and write down the gift you want the club to give you, not too hard. Just a poster, a photo signature or something. (Your name) (Date) However, because it is international mail, it takes a long time, and these football clubs receive many letters every day. These staff who are in charge of receiving letters in the club are very hard, so sometimes they ignore some letters. Even if they reply to you, you will have to wait a long time to receive it. From sending a letter to receiving a reply, the shortest time may be 2 or 3 months, and the longest time may be the first half of the year or even 60 years. For example, writing a letter to a club, like sending a text message when CCTV5 watches football, won the prize 1000, and the chances of getting a reply are very small. If you still want to write, you can write 2 or 30 more letters, so that they will have a greater chance of seeing it.