I didn't mention Sir/Madam intentionally thinking I should know my manager is a male or female before writing this letter. Let me know if you think otherwise.
As I know, there are two salutations that can be used:
1. (Semi) Formal letter: Dear Sir or Madam. Or if you know the one's name, then you write this: Dear Mr Kennedy
2. Informal letter: Dear Kennedy,
Is it mandatory to write the letter maintaing the order of the given points? Can't I rearrange them?
Writing in order of the points given makes the purpose of the letter clear and shows a well-organised layout.
When you deal with IELTS, the first thing the assessor sees is your layout
, which shows whole of your essay. If the layout is difficult to read, then he/she immediately knows your writing needs more work to read.
I could not think of any appropriate phrase except "Awaiting your approval". Is it ok? Can you please suggest one?
Everything is OK, rims :D However, you'd better use the phrase depending on the tone of the letter (formal or informal).
Formal: I await your approval | I await your prompt response, etc,.
Informal: Awaiting your approval | Hoping for your approval, etc,.
Hope this helps :D