I assume you mean you want to control the RPM of your fans? Newegg sells fan controllers if thats what you're looking for? Or are you asking where to place your fans on the case? If so, what are your options?
there should be a q-fan control in your bios. Is it the noise of the fans that is bothering you? if so, q-fan control in bios or get the speed-fan program adamh9 talked about. If the noise isn't bothering you, leave them on full. its easier to replace a shot fan then shot Hardware. the cooler the better.
oh , are your fan's hooked up directly to your Power Supply? or do you have them plugged into your mobo? go do your Motherboard brand's website and download the manual. it will tell you where to plug the fans into the motherboard.