Salutations in an application letter

i am writing an application for seeking admission in school of my 5.5 year daughter.

kindly check and if any changes required let me inform.i am gratful to you. kindly treat as urgent.

thanks to all.

Mrs a.a

To,

Saint Joseph Girls Schoo

Administrative Department

November 18, 2011

Dear Sir/Madam,

im quite confused here whether i should write my own letter and where ,as the school administration has asked to write letter on your own letter head.Please help urgently

Best regards,

Mrs a.a