How to write a formal letter

                                                                      11, Pla de  les vinyes
                                                                      Banyoles, Catalunya
                                                                     28th October

Dear or Madam 
I am a tennis player of an tennis club in Olot, Catalunya. The name of the club is Club Tennis Olot. I wrote to you because we are planning a tournament and we are looking for sponsors.
The tournament will take on April. Teams and fans from four countries going to be in Olot for this event and think that it will to be  good publicity for a sponsors.
Please contacting me if you are interested in sponsoring us or if you needs any more information.

thank you

Your faithfully
FERRAN ILLA