This is how I taught my middle school students to write essays. I used a method called Power Writing. This 37 page power point explains the basics. I taught inner city students. To be blunt, there writing skills were just horrendous. This "system" saved me.
If you'd like me to work on lessons to go with this, please leave a comment and let me know. I'd have to do most of it over the summer. However, I could do a few worksheets if anyone asked.