Research your subject well. You can gather information from personal experience, experts and previously printed texts.
Write out an outline and a rough draft for your textbook and then your final draft. You can type out your textbook in any computer word program or you can purchase specialty software.
Join the self publishing website Lulu. When registering you will have to provide them with your name and email address. You will create a username, password and a name for the store front that Lulu will provide to you.
Log into your Lulu account and click on the publish tab.
Choose textbooks from the available types of books that you can publish and then choose which type of cover you would like (hardcover or paperback).
Give your textbook a title and then choose as to whether to keep your book private or public. If you make the textbook available for public sales, it will be sold on the Lulu website as well as Amazon.
Choose the size, binding and color of your textbook and click on the "Save & Continue" button located in the bottom right hand corner of the page.
Upload your textbook to the Lulu website. Your textbook is now ready to be printed. Order as many copies as you like.