If you like them I'd recommend checking out the Heir to the Empire series as well. It's written by the same author so Thrawn character wise is pretty consistent with the new ones, but it's in a different setting. The audiobook versions are quite good too since they add sound effects and music to help immerse the listener.
There is also a comic of the first Thrawn book if you need to place faces to names. The sequence is a little different but all the story components are there.