Make a list of all the people who helped you write the book. Include those who supported you emotionally, provided advice, editors, experts and sources you interviewed.
Prioritize and narrow down your list, combining names into groups if necessary. For example, instead of listing each member of your writers' group, list the group name. Consider dividing your list into two. On one list, add personal names, such as family and friends. List sources, experts and editors on the second.
Write the dedication, thanking the people on your list. Remember to write with wit and style. Show personality. Use the first list to create the dedication and the second list to create an acknowledgments page.
Edit for grammar, content and, if necessary, length.
Let it sit. Give yourself time to reflect on what is written and to remember any missed names.
Review once more and submit.