In writing procedure essays the 2 essential things to remember are:
1) We need to use the imperative form, do this, do that, don't do this,. Sometimes we were given flow charts with the -ing form and we had to remember to change this.
2) We need to use linking words, like: first, secondly, then, next, after that, finally.
We always divided these essays into 3 paragraphs: introduction (20-30 words), main paragraph (90-100 words) and conclusion (20-30 words) in total: 150-160 words.