Make sure your manuscript or prospectus is ready and in perfect condition. Depending on the publishing house, editors will want to see either your finished work--the entire manuscript--or your book's prospectus. According to the website for Pearson, an education publisher, your prospectus is the basic outline for your book. What you send to the editor needs to be in pristine shape--no errors of any kind.
Research the market. If you are writing, for example, a book for teachers about teaching methods, research other books that are similar. Likewise, if you're writing a textbook or manual a teacher might use, make sure you are familiar with other books on the market. Make sure your book stands out. Provide something new, insightful and fresh to the field, as editors don't want to publish the same book over and over.
Research possible publishers for your book. Make sure you get to know the submission guidelines for every publishing house to which you send your book. Some educational publishers that print books for teachers include Routledge (Taylor and Francis Group), Pearson and McGraw-Hill Education. Make sure they publish and are interested in the kind of book you have written. For example, while one educational publisher may have a series about foreign languages and cultural teaching methods, another may not print anything of the sort. Do your homework before blinding sending in your submission.