A business letter should contain the date, sender and recipient information, and a few body paragraphs. It should be typed in a common font like Arial or Times New Roman using block formatting. The letter size should be 8.5x11 inches or A4 if outside the US. There are 12 parts to writing a good business letter for beginners: return address, date, recipient address, salutation, opening, focus, action, closing statement, complimentary close, signature, typed name, and enclosure if applicable.