Before embarking upon your Universe of Xuya quest, i would suggest that you visit “The Universe of Xuya” web page and bring yourself up to date with the time line and how things evolved in this alternative history.
The Xuya series takes a bit of work collecting all the different stories that are scattered around many different sources, but, it’s certainly well worth the effort — a really good series. If you click the links below and go to the book’s page you’ll find the source i chose for each one.
The Universe of Xuya
Dominion of the Fallen