For those who are looking to publish with a big (traditional) publishing house, either while you’re self-publishing or instead of self-publishing (it doesn’t matter these days), Jacqueline has posted some information about the very important cover and query letters.
And it goes without saying (but it’s important so I’ll say it anyway), your manuscript has to be as best as you and your editor can make it.
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Sample cover letters, query letters, and comments on the art of writing them, by Jacqueline K. Ogburn, published as part of a WWW site dedicated to children’s books and the writing and illustrating of them.
Source: Rites of Submission: Cover Letters and Query Letters