Two EFL writing manuscripts are available to you from TEFL Boot Camp for free.
Download them and read them and you will see EXACTLY how to go about teaching basic writing skills to your EFL students.
These two books are very methodical in their approach to helping students improve their writing skills. When you are teaching EFL writing, you will often find that your writing textbooks move far too quickly from point to point and these two resource books were written specifically to slow it down a bit and help students practice and acquire a skill and become competent with it before moving on. Do slow things down and be sure to tie each lesson in with the previous lesson, linking their skills together as you go. That will facilitate long-term retention of the skills rather than the typical use it once and forget it approach many coursebooks take.