Although every winning query works its own magic, all good queries should contain the following:
• A "grabber" or hook sentence that makes the reader want to get his hands on the actual novel.
• One to three paragraphs about your novel.
• A short paragraph about you and your publishing credentials (if you have any).
• A good reason why you're soliciting the person you're soliciting. (Why this agent or publisher instead of another?)
• The length of the novel--word count.
• A sentence or two about the intended audience.
• An indication that an SASE is enclosed if you are sending it through the mail.
FORMATTING
• Use a standard font or typeface.
• Use a 1" margin on all sides.
• Use block or semi block letter format.
• Use letterhead or put your name, address, phone number, e-mail, and fax in the top right corner.
• Address your query to a specific agent or editor (call to get the appropriate name).
• Try to keep the query to one page, but it's acceptable to go as long as 1 1/2 pages.
• Single-space the body of the letter; double-space between paragraphs.
• Catalog every item you're sending in your enclosures.
OTHER DO'S AND DON'TS
• Do state any previous publishing credits.
• Do mention if your novel isn't finished, and state the date your manuscript will be complete.
• Do tell if you're sending simultaneous submissions to other agents and editors.
• Do address your letter to a specific agent or editor.
• Don't e-mail or fax your query unless a publisher or agent requests it or if their guidelines state it is acceptable.
• Don't mention that you're a first-time writer or that you've never been published.
• Don't spend much time trying to sell yourself. Your manuscript will stand on its own.
• Don't state that some other agent or editor has rejected your novel.
• Don't ask for advice or criticism--that's not the agent or editor's job at this stage in the game.
• Do summarize any relevant experience you have.
• Don't mention anything about yourself that is not pertinent to the novel.
• Don't bring up payment expectations (advances, royalties, etc.).
• Don't mention copyright information. The manuscript is yours once it's in printed form.
• Don't staple your query letter to your manuscript.
• Don't go over two pages.