RTFM!
The clutch fluid is DOT4 brake fluid. The reservoir can be found on the driver's side of the engine bay. The transmission also has oil that needs to be changed. I would say do both at 30K (I believe that is the recommended interval for the trans). You should also do the rear diff oil as well. There are posts in the DIY section that can recommend the proper oil and guide you through the process.
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Competition Clutch|Fast Intentions|Maxbore|NST|Setrab|Stillen|Tomei|Uprev| Z1
Avant Garde|SPC|Stance|Whiteline
Aerojacket|Seibon|Tanabe|TRS|TWM
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