First, for gameplay, read any book that costs more than 50 Gold. Those are skill books and you will learn a skill if you have not read the book before.
As for Lore, I hate to say it, but most of them have some Lore in them, and the titles are pretty easy to figure out which ones are more Lore than others. However, there is a reference for all the books in this game and previous games
http://www.imperial-library.info/
So, you can catch up on your lore there. Note, the Skyrim specific books may not be up yet.
This is the best idea. If they're expensive, read them. Everything has lore in too, though. I remember when I first started and reading some book I thought were important, and ended up getting a good laugh out of because they're funny. And that made them just as important.