>Where do I need to go to learn about book piracy?
Make the rounds of the chans and reddit keeping an eye out for links and so on. Be quiet, lurk, don't request; you'll see what you need to see soon enough. Hit up any torrent sites or wikis with howto guides.
>What are your virtual libraries like?
About eighty percent organized by subject and author under my own system.
>What do I need to know?
Book sharing runs under the radar for the most part. This is partly due to the glut in the used book market making it too expensive to police. Now add in the irony of quaint idealism promoting methods to bring freedom to police states who are more than happy to shelter resources which free us from our own copyright dystopia in turn.
That's where we are today.
Be aware of a slow motion backlash building against it, following the pattern of the software, music, and movie sharing scenes of a previous age. Some works readily available in the past are harder to find today, and some excellent sharing sites are gone. The best sites are reborn elsewhere, in more protected areas, often in anticipation of a parent sites' pending demise; we are still in the golden age.
Torrent a book collection or three and you are set for life.
Set up a system of organization first and stick to it.
Learn to use a file duplicate finder.
Learn how to convert between formats.
Learn to use Calibre.