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You might find an editor who works for a textbook publisher, an independent editor, or a colleague who works in a similar subject matter. But you need to have at least one other pair of eyes on your work. The editor will be able to help you find the best way to organize and clarify your content. She will also be able to assist in sentence-level improvements in grammar and word choice. When publishing a textbook you can either work with a traditional textbook press or you can self-publish. Traditional presses for textbooks include Pearson, McGraw-Hill, Cengage, W.W. Norton & Co., etc. If you work with one of these publishers, you will generally receive around 10% of the royalties for each book sold. Look up the "Contact" information on the publisher's web site. They will generally have guidelines for how to submit a book proposal or get in touch with an editor. In order to get approved by a traditional press, you will need to provide the publisher with a book proposal. The book proposal will generally provide the title of the book and a 1-2 paragraph summary of each chapter. Make sure you clearly explain the content of your book and why it will be important for your target audience of students. Make sure the book "fits" the publisher's list of books. Do they sell other books similar to yours? If they do, this is a positive sign because they won't have to spend extra money marketing a different item on their publishing list. With traditional presses, you will also have to sell the copyright of your work to the publisher; you will no longer have rights over the material once you sign a contract with them. . Because publishing with traditional presses can sometimes be a competitive process, more authors have turned to self-publishing -- often with more profitable results. Amazon.com recently entered the textbook publishing game. If authors sell their self-published textbook through Amazon for $9.99 or less, then the author will receive 70% of the royalties. This is a significantly higher rate than the 10% that is often offered by traditional presses. You could also make your textbook available for purchase through iBooks' textbook platform or through a personal web site. With self-publishing, you often don't have to put together a book proposal and you can generally retain your rights to the material. However, it is harder to spread the word about your textbook to schools and universities.
Hire an editor. Publish with a traditional textbook press. Self-publish your textbook