Letter Of Encouragement And Catholic Confirmation How Do You Write A Letter Of Encouragement For Catholic Confirmation?

How do you write a letter of encouragement for Catholic confirmation? - letter of encouragement and catholic confirmation

I will write a letter of encouragement to the confirmation of my friends children. (A boy and a girl from school)
I am not Catholic, not at all religious. I want to be not quite honest. I have no idea where to start. Please help! This is very fast.
Thanks