been playing around with inav for 2 or 3 months now. as sean has said watch the painless360 and have a look at project blue falcon has a series as well on youtube. the current version of inav is 1.9, calibration is quite a bit easier than what is shown in those videos and now has its own mission planner.
as far as the NAZE, it is listed in the targets. inav has a facebook group, which is where i have gotten info and support from, good knowledge base there.
i started out with an omnibus f4 v3, the v3 doen't work, not enough uarts. ended up with matek f405 ctr, has 5 uarts.
anyway, for a easy, economical gps setup, inav is the way to go and improving all the time