What they don't offer is proofreading and editing for free. They offer it as a paid service, but I haven't checked into that.
I would suggest that you start by proofreading your content for grammatical and spelling/punctuation accuracy. Have a friend or co-author do the same. Next, hire an editor to go over the book and look for consistency, tone, sequence (if that applies) etc.
Then take a look at CreateSpace to see how comfortable you are with their site. Don't hesitate to use their free telephone help line if you don't see how and where to get started. I have a lot of fun beginning with the cover creator. Once I have that done, my books begin to feel real, and I add the content into their word templates. Their step-by-step guide is easy to follow. When they receive all of your content, they will offer you an online "Proof" and also offer a hard copy (paperback) at a very reasonable price (mine are usually between 2 and 4 dollars, plus shipping. Having that proof copy in your hands is an exciting moment. Finding more errors as you read through the hard copy is inevitable - but that's why a paper proof is so important. To fix the errors, you simply open your online proof copy and edit, and ask them to run it again for another proof copy. I've done that with some of my books three or four times until I finally get it right. And then when I am satisfied with my work, I tell them to publish. I order any number of copies to sell (or give) locally to friends and family, each at the same low price of the proof copy.
You'll set the price for you book using the guide that is on the site. CreateSpace will also invite you to send the copy through another format to produce the e-book copy for Kindle. Amazon will have both your paperback and kindle edition posted on their site within a day or two's time.
Lots to do - get started, and know that I'm here to answer any questions that come up - or just be a cheerleader for you. I also do proofreading and editing, but I have to charge for that, as I'm retired and that is my new job. You can check out my prices at my website. Here's the link to my services page:Terry's Thoughts and Threads Services
Wishing you confidence and good outcomes! Happy Thanksgiving.