This is one of those situations where there are two answers. One for the real world, and the other for exams.
In many exams you are expected to use 'Dear' & 'Regards' (or 'Kind Regards') in formal emails, so use these in an exam. In the real world people people tend to be more relaxed about emails. To me this sometimes seems a bit wrong, and so I often use 'Good morning/afternoon/evening' in a formal email and 'Hi' in informal ones.
A greeting before the content depends on the culture of your country or the company you work for, but I think it's nice. Can't hurt, so why not.
There is a small mistake, you should 'finds' (the email is 3rd person) not 'find'.