Welcome, Dave. Check out the Wiki (top of your screen) where there are lots of resources listed, including a list of many sites that sell ebooks in a variety of formats. As to PDFs, I routinely use the free PDFLRF utility (again, check the Wiki for a link). It works very well on non-DRM PDFs, although my usual use of it does rotate the page to landscape mode. But you'll find the result very much easier to read than an unconverted PDF if it was formatted for 8-1/2" x 11".
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