Some questions

Why is writing important for an EFL teacher?
It is very important, it´s fundamental for a teacher know how to express his ideas in a proper way and commiting the less errors possible. It´s a good way to put in practice our grammatical knowledge and improve and a lot of aspects of our English skills.

What is the best way to teach writing to children?
Nowadays is very difficult to encourage the habit of writing since our world is domained by computers, television, videogames and nobody seems to care about reading or writing.
When we want to teach how to write to children the motivation is probably the most important factor.
Making entertaining activities such as the use of a blog may work pretty well in younger generation of students.
Another way to teach how to write is just allow them to invent their own stories, is a very entertaining and reguarding activity.