I still own and occasionally re-read some of the Star Wars Expanded Universe (EU) novels, which are relabeled to the non-canon "Star Wars Legends" now. IMO, they're so much better than the direction the Disney canon went. Since they're by so many different authors, the quality varies wildly, but I'd say my favorites are Timothy Zahn, Michael Stackpole, and maybe Kevin J. Anderson. But some other individual books or trilogies are great, too. The whole thing is huge, but frankly just fun serialized reads, so not too difficult to get into.

Truce at Bakura kind of kicks off the whole thing, but the best intro is the trilogy by Timothy Zahn, which starts with Heir to the Empire. There's a few books in-between Truce and Heir if you want, like The Courtship of Princess Leia and the excellent X-Wing series, but I think the Zahn trilogy really sets the bar high for everything. If you're interested in following up, that's where I'd go next, and then you can go back and fill in the others if you wish. One of the issues with the EU is that while you don't need to read every book/comic, they do form a continuity, so it can be mildly confusing if you read a reference to something you haven't read about yet.