Where do I start? (honest answer)
Sifu Michael Johnson
the author
Start with The Stone Garden. It is Book One of the Chronicles, it explains itself, and it will tell you within twenty pages whether this is for you. The Rebirth trilogy is the myth underneath everything, and you can read it before, after, or never, and the Chronicles still works. Some people want the gods first. Some want the adventure first. Neither of you is wrong. If you want the shortest possible test: read the first chapter of The Stone Garden. If the stone garden itself does not get you, we part as friends.
Sifu Michael Johnson
the author
One more thing, because I get asked it a lot. You do not need to know Greek myth. Troy shows up, Carthage shows up, real history shows up, and the books assume you know nothing. If you do know it, you will catch things earlier and enjoy being smug. That is the only difference.