In the second paragraph, use evidence and persuasive reasoning to justify your main point. Date: Different people put the date on different sides of the page.
If you are familiar with the addressee, then use their first name unless they have specifically asked you otherwise. Such letters are written for official purposes to authorities, dignitaries, colleagues, seniors, etc and not to personal contacts, friends or family.
Skip a line, and enter the correct format for the date. Skip a line, and enter the suitable and appropriate complimentary closing.
Conclusively, it should be neat, professional, and follows the standard formats. Begin with the name of the addressee on the first line.
Skip a line, and begin the content of your letter.