If it's a version of the OS that has Apple System Profiler, it'll be under the Apple menu. As for RAM, they take a good deal more than Apple 'officially' supported. When later 128MB SIMMs appeared, they worked fine, for up to 256MB (I have that configuration in one of my 6100/66s)
Standard, they have some pretty slow graphics, and perhaps the best upgrade for them if you're able to find one cheap, is one of Apple's PDS graphics cards. The PDS (processor direct slot) is the one on the far left of the machine, and needs a riser card to fit the graphics card. You can also get NuBus adaptors that turn the PDS into a NuBus slot, and use a higher performance NuBus graphics card in them - both options are way quicker than the standard graphics. Best option all up would be one of the G3 accelerator cards built as a riser card - it's about 1.5inches high, 8 inches long, and some models allow you to use both higher performance graphics along with the G3.
They're not really a well-collectable machine, though I love the large pizzabox shape!. If you want specs, peek on
http://www.everymac.com/systems/apple/ - and for a bunch of useful folk 68kmla.net has plenty of beige mac addicts who may be useful for sourcing parts
