Well as someone who travelled 25km every weekend just to play dota (local MP) for 3 years flat I have the following to say:
1.
Gamers scream a lot. So do not place all of them facing each other. It leads to awkward situations. Place a small blind between them. Don't take this point lightly.
It's better to have a row of 5 PCs for each section (for teams). Don't make it look like school by stacking them all together like in an office. So a set of 5 PCs here and there
2. AC is good idea. Chennai is damn hot. I don't even have to say that to you.
3. Get decent PCs with normal monitors. Don't blow them too much or you'll end up broke. 40k PCs are fine.
50k ones even better. Also have atleast 3-5 high end (60-75k)PCs are charge more or mark them special.
Gamers don't care if it's a high end PC or a low end as long as it plays the game they want. Also most gamers play CS or Dota, both low on specs and the only use for high end PC i have seen is WoW. Of course the latest ones wont play but you have to get a fine balance between them. Don't blow on expensive hardware. Also be honest, tell them it wont run latest MW3s etc and point them towards the high end PCs for that.
4. Get a normal Logitech KB which lasts long. No need of gaming mice. Buy regular Logitech mice. (they last long) Don't go for fancy stuff. They wont last long anyways. Get normal mouse pads for everyone. Get decent swivel chairs. Don't offer headphones. You will end up paying a lot for damaged ones. You don't want to be arguing with your customers if he is at fault or the prev user etc etc. Also hygiene issues which will make the headphones give a sweaty nostalgia no one wants. But give an option to use their own headphones by using a comfortable 3.5mm cord extension. Or you can offer normal cheap headsets from logitech. They will die anyways and could be the most replaced item, followed by mice and KB.
5. Hire some one for cleaning, gamers are dirty but like things to be neat around them. Also keep stock of chips, coke etc. You might end up earning more or equally on these as many gamers skip lunch etc to game. I did for 3 years flat every Sat-Sun so I can say that confidently.
6. Keep the lighing dark and get posters on the wall. Get a nice friendly gamers chap on the money counter.
7. Location: If possible and I strongly suggest- Near a college
8. You really need a net connection or forget gaming in todays world.
You will learn after you have opened and no one can tell you.
Most important factor for a gamer is the price. So to keep the price low for the consumer you have to keep the price low for yourself. Hence skip having all high end PCs, expensive gaming mice, KB, audiogear etc.
As a gamer and a regular psychotic addicted customer I was only looking for a decent comfortable space, cost, the screen size and of course the food available.
I never even bothered about the specs or resolutions, the kind of mouse or KB as long as it wasn't greasy
and audio ( I now realise I know none of the game sounds coz of it and I still paid, the lowest 30/h and at most 50/h