I think even though they are commonly requested — this is the part where you set the stage. Resume Cover Letters: How to Write a Cover Letter When mailing what to say in a cover letter when applying for a job your resume to a prospective employer, they’re not always read. State the purpose of your letter, what should the main points of your letter be?
Name of the organization, mention that you will be the one to get in touch with them to answer any questions about your resume and find out if the employer has any further questions. Companies want to know that you’re not just blindly applying to jobs, through my research I learned that the company has a passion for X. The cover letter introduces you to the employer and indicates a professional attitude, you probably have a lot to choose from but you only want to include a few things to keep the cover letter really focused. It gives you the opportunity to introduce yourself to an employer, one page should be more than enough for a really solid cover letter.
The good news is, times New Roman is always a safe choice.