Use a standard business letter format and template
The most widely used format for business letters is "block style," where the text of the entire letter is justified left. The text is single spaced, except for double spaces between paragraphs. Typically margins are about 1 inch (25.4 mm) on all sides of the document, which is the default setting for most word-processing programs. If you are using Microsoft Word, you can turn to its built-in Letter Wizard for additional formatting assistance (look on the Tools menu).