Counter,
In JW land, the faithful & discreet slave is now taught to be 7 guys at worldwide HQ who are the Guardians Of Doctrine for the entire religion. (their words, not mine, although they don't teach that at the meetings)
The "lay people" as you said it, are what many here call the R&F or rank and file - that's your everyday JW person, male or female. Sometimes just referred to as Publishers
From the Publishers, though, come the pioneers (preaching hour quotas for these people), elders (men who need not be elderly nor older, nor mature - from my experience), ministerial servants (men who help the elders)
As for the Class system, locally, the elders are at the top, followed by their wives, then the ministerial servants and pioneers. Organizationally, the 7 guys at HQ (aka Governing Body) are on top.
With so many men "on top" its a bit hard to not get a bit screwed.
If you're studying or considering studying, my personal recommendation is to RUN - fast.
The truth is supposed to set you free, not enslave you.