The basic structure of a formal letter: The rules might be arbitrary, but taken together they create a formula that produces clarity. When a letter follows all the rules, the reader doesn’t have to struggle to figure out where a piece of information might be, what action they should take next, or who sent it _ everything can be found in its place. Knowing the rules of letter writing is, in that sense, akin to knowing the rules of page layout or web design _ the format of the document should support and clarify the content.
Beginning the Letter. Know the format: There are some business standards which need to be followed. One must use a common font to type a business letter. One must use indentation, paragraphs, margins etc. The text must be typed in black color only. Choose the Right Kind of Paper: One must print a letter in a letter sized paper. The standard size of the paper is A4.