We haven't looked at a General Writing task 1 for a while, so here's one from Cambridge IELTS book 11:
This is a formal letter task, and you would begin with "Dear Sir or Madam". I would probably start with a sentence that explains why I'm writing the letter (e.g. I'm writing with regard to...), and then I would write a short paragraph about each of the bullet points.
I'll show you my full answer tomorrow.