Begin the letter with both your address and the address of the person you are sending the letter to. Your address should be at the top right corner, while your target's address should be on the top left corner, beginning just below yours.
Type the date on the line following the address. You can write it one either side of the page, according to your preference. When typing the address, always spell out the month.
Type the greeting just below the date on the left side of the page. The greeting should begin with "Dear" and then the proper name of the recipient. For example, you would type "Dear Mr. Smith," as opposed to "Dear Tom."
Close the letter with a proper ending. Something like "Yours Truly," "Yours Faithfully" or "Yours Sincerely" will suffice. Type your name just below the closing statement.