If you want to look at RQ the system then all you need is the basic RQ rulebook. Try for the Avalon Hill softback rather than the boxed set(s).
If you want RQ3 stuff useful for background then in order of usefulness I'd say
Glorantha: Gernetela (Absolutely essential)
Gods of Glorantha
River of Cradles
Trollpak
Elder Secrets
Sun County
Shadows on the Borderlands.
RQ2 stuff is very hard to come by except for the current excellent reprint of PAVIS/BIG RUBBLE which you should snatch up if you see a copy.
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