How is writing a letter explicative for study in canada !

[Ahmedfloyds]

hello
please How to write an explanatory letter to language study at the Institute of Canada
Knowing ... i am work supervisor ... and I want a writing " explanatory letter " witch explained that the director wants to work cost me the task of traveling to study
English in order to communicate with foreign workers, who are under my command
How is it that..... I want to model

thanks