Write a cover letter

Sujet du devoir

J'ai une lettre en Anglais à écrire.
Voici le sujet :
Hi, I am currently looking for a French student to baby-sit my son aged 3,on Saturdays.My son Kemaale can already understand some basic.French and the work would be mainly to play with him,speaking French all day.
Let me know if you are interested and tell me about yourself.

Où j'en suis dans mon devoir

Dear sir or Madam,

I am writing in response to your job announcement on the net for baby-sit your little son Kemaal and learn the french by playing.
I am 16 years old and I am in High School,so I can looking your son on saturdays,because I don't study on week-ends.
I am interested in this job because I love to keep babies and I would really enjoy being in contact and learn french while playing with them.
I have already looked after babies,I think which I would be very efficient,caring and responsible.So I think I would be great for this job.

Thank you for your time and attention
Sincerely,