How do you write a letter to principal for opening a canteen?

When writing a letter to the principal you need to remember to write a formal salutation at the beginning the letter;

e.g.

- To the Principal of (the School's Name),

Then you need to continue by writing what you are writing to inform ( the message of the letter).

e.g

- On behalf of (the School's Name), we would like to have the permission of opening a canteen. This is because....