I don't have any experience in preparing a book for uploading, but the below links may be helpful in making the project into a do-it-yourself easy process.. (what are the books about?)
Smashwords main link..
https://www.smashwords.com/
The Smashwords Style Guide...(Free)
http://www.smashwords.com/books/view/52
And... How to Publish on Smashwords...
https://www.smashwords.com/about/how..._on_smashwords
The below shows format options available to customers....

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