The first thing you need to know is the different parts of an email, and these are:
Greetings: Informal: Dear (first name), Formal: Dear (mr./ms/mrs./miss. last name)
Opening paragraph: we react to the other person’s news and answer the questions.
Main paragraph 1: in this paragraph we deal with the first important point, which we can identify in the instructions.
Main paragraph 2: if there is a different point to deal with, this paragraph will do so.
Closing paragraph: in this paragraph we «start» to say goodbye by wishing the other person well and asking them to reply to your email.
Goodbye: we use a short expression to say goodbye.
Signature: we sign the email with our name.