To the club. Generally speaking, writing English is ok! Of course, it would be better if you know Italian, German, Spanish and so on. When I bought a football club in the past, I saw a lot of letter worms writing letters, all of which were written directly to the club. Some clubs still have a high response rate, and they also give gifts, usually star's signature cards and team flags. However, this round trip will take several months, so be patient. When there is no hope after a long wait, there will often be unexpected surprises! The address and zip code can be found in the club official website.