If you're just copying the content from your website into your PDF ebooks, there is a high chance that Google will be able to scan through your PDF and penalise you for duplicated content. However, if you wish to go ahead with uploading a PDF ebook, you would have to include the preferred URL / specify the canonical version in your page. This Q&A article by Google may help you in this (http://googlewebmastercentral.blogspot.sg/2011/09/pdfs-in-google-search-results.html).
However, I'm not sure if putting articles about vacuum cleaners, skateboards and other unrelated topics into an ebook will be useful from the perspective of content marketing. It would be preferable if your ebook consists of articles under the same topic, which provides more targeted help to people needing advice in a certain area.
Just a suggestion: Why not consider using the ebook as a "freebie" to entice visitors to sign up for your newsletter? This way, you won't need to host your ebook on your website, and use it as a content marketing strategy at the same time.