I am going to look for work as a Family Nurse Practitioner in a Hospital or clinic
I have attached the link
Professional letter examples. It is your cover letter, the one you send as an invitation to consider you as a candidate for work position, or research grant recipients as two examples of its use.
https://www.indeed.com/career-advice/cover-letter-samples/nurse-practitioner
http://www.coverletter.us/nurse-practitioner-cover-letter/