An Auror is a dark wizard catcher. The head Auror is the person in charge of the department and all Aurors. Harry Potter became head of the Auror office. Previously it was Kingsley Shacklebolt.
Professor Alastor "Mad Eye" Moody was an Auror.
No he becomes an auror then head of the auror department.
He ends up as an auror, so does Ron. Hermione is also an auror, but she's the head of the auror office.
He becomes an auror and the eventually the head auror. According to JK Rowling in an interview shortly after the release of the last book.
He's an auror
He is an Auror in the ministry for magic
1988.
Auror.
Head Auror
He's grown up and already living his dream as a singer.
Nothing. He becomes an Auror.