Note that in general Lulu expects you to be able to handle the responsibility of what you are doing. You are going to edit your own words, looking for typos. You are going to create your own covers. If you want Lulu to help you with those tasks, Lulu is going to want you to pay them to do that.
In general I suggest going with CreateSpace over Lulu because of the enormous reach Amazon / CreateSpace has to the reader marketplace, but there are certain situations where Lulu is the better choice. For example, Lulu has a nice range of hardcover options.
Here's how the Lulu system works. In this tutorial I'm covering the paperback process.
Publishing On Demand Step By Step - Lulu
Lulu Self Publishing - Setting Up the Book
Formatting your Book for Self Publishing
Creating a Lulu Covers
Setting the Lulu Description
Setting the Lulu Preview
Promoting your Lulu Book
Problems and Issues with Lulu
Ebooks on Lulu
Lisa Shea Free Ebooks
Lisa Shea Full Library of Published Books
Getting Your Book Published
Writing Tips and Online Books
Lisa Shea Medieval Romance Novels
Online Literary Magazines
Lisa Shea's Homepage