Welcome, monkey-man. You'll like it here.
Kenji's link takes you to FPW's Secret History of the World which is, very roughly, equivalent to the Adversary Mythos (the moniker Adversary Cycle is normally used to denote 6 novels within that Mythos)
Jack's first appearance (in the Mythos) is in Jack: Secret Histories and its sequels which take place in the very early 80s (the Young Adult Novels). The Tomb and its sequels, with grown-up Jack, begin in Year Zero Minus Three.
Everything after that except "The Barrens" is a Jack novel or story until you get up to The Touch in Year Zero Minus One.
Of course, Jack appears in the revised Nightworld, but you naturally will want to hold off reading that until FPW has finished the last three Jack books (one of which, Ground Zero, is being published shortly by Gauntlet Press right about now, with the mainstream version in the mid-to-late fall).
-Wapitikev
Axioms Jack seems to live by (inadvertantly or not):
Why he does what he does: "I chose this life. I know what I'm doing. And on any given day, I could stop doing it. Today, however, isn't that day. And tomorrow won't be either." Bruce Wayne, Identity Crisis
On Rasalom: "Water's wet, the sky is blue...and good old Satan Claus, Jimmy...he's out there...and he's just gettin' stronger." Joe Hallenbeck, The Last Boyscout