Using an online self-publisher (like iUniverse or Blurb), format your manuscript to fit the template provided.
Choose a typeface, and determine whether you want a hard or soft cover and what that cover will look like.
Wait for the publisher to complete your book. Some will even add your book to a seller's inventory, like Amazon.
For a nonfiction book, submit a query with sample chapters and a synopsis to publishers. For fiction, complete and send the entire manuscript.
Keep submitting your manuscript to publishing houses. More submissions increase your chance of selection.
If your work is picked up, work with an editor or other representative at the publishing house.