PICS NAO
i learned about rotaries first from searching forums and this:
http://www.rebuildingrotaryengines.com/
then I bought the mazdatrix rebuild dvd before I rebuilt my motor.
The other wonderful half of knowing about engines is engine management. The megasquirt ecu is a fantastic standalone that's cheap and do it yourself. I built one for my miata's 1.8 and I'm so glad I did- it makes you learn about the entire fuel injection process. I was able to modify it to run my rotary later. You can learn more about them in the megasquirt subforum of rx7club.
I should probably write a how-to with megasquirts.