You do not have to complete the complex preparation work to upload the text files, but you can shorten the time and the amount of editing if you delete the title page with the book’s title, the author’s name and the contents page (the service will automatically add both the title and the contents into the final design).
Moreover, working with the service will be much simpler if you format all the text passages with necessary styles. Almost all editors like Word, OpenOffice, Pages and so on have this layout tool. It actually does not matter how the title looks, it is important that Ridero recognizes it as a title, and not a foreword, for instance.