I'm getting a i5 4690, nvidia gtx 760 and 8gb 1866 ram. I have the default cpu cooler and 1 case fan. (I think CyberPower default case fan means 1 case fan) I won't be ocing, will this be enough for gaming likr planetside2, dayz, far cry 3 etc.
You'll soon know if they overheat... so go ahead, buy the setup, and if you need to you can buy extra case fans later. The most important thing is that you use the case fan you have in the right place - at the rear or top (but normally the rear) as an exhaust fan. Then if you get a second fan, put it at the front as an intake
The only thing you really need are case fans don't worry about RAM or GPU cooling. The GPU has its own fans and the RAM won't overheat unless you overclock like crazy.
My case only has 3 slots for fans/exaust (CM Elite 310). Will that be fine when I add them on? And will they be compatible with Gigabyte Z97-HD3 Intel motherboard?
However if you're really worried about over heating, which again shouldn't be a problem, then you should get a H100i water cooler for your CPU. Although I'm not sure what case your using so I don't know if it will fit your case.