Make a list of the most interesting or distinct points about your story. Try to keep the list relatively short. A lengthy pitch letter is likely to be breezed over by the person who reads it.
Format your pitch letter like a typical business letter with the date and contact information at the top. Address the person who will read your story pitch by name, if possible.
Start your letter with one sentence that is likely to grab the reader's attention or make a particularly interesting point. Use descriptive words in your first line, but avoid clichés and awkward phrases. Quoting a statistic or linking your story to a current event can help.
Add one or two paragraphs describing your idea in detail to fill in the rest of the letter. Tie your story idea to the publication's audience. Use professional language and avoid slang and jargon.
Close the pitch letter with a statement indicating your availability to discuss the idea further in person, or over the telephone or by email. Sign the letter with your full name and add your contact information.