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what else should i need to buy in terms of hardware? router? what type? cables?
buy reliable router & 16/32-port switch should do the job.
cat5e should be enough for today.
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do i need top buy 10 UPS too?
1x UPS need for billing PC.
AVR* optional (CC located area that electric surge very often, AVR should do the job)
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do i have to install games n software at each of the PCs?
I. install basic software & games at single PC, then deploy image/clone to multiple workstation
II. try google "
cyber cafe diskless"