Hi BookDove, nice nickname and nice signature too :)
Now, if you haven't ebooks but paper books if you want to upload them yes, you must use a scanner and scan those that you want to upload, usually every scanner has a OCR software, which means you'll have your books in some format (.pdf, .doc, .rtf, etc.).
Unluckily OCR software make some errors, so you'll have to check the results. Then my advice is to convert these files in .pdf, or if you can also in ebook formats - mobi, Epub.
That can be done using Calibre, e free software you can download from
http://calibre-ebook.com/