And maybe buying more in future to replace the fan which came with the case.
If I was to buy this fan though, where should I put it? I am new to computer building still, so I am quite clueless. I am thinking about putting it at the rear as an exhaust fan to take out all the hot air coming from the CPU, GPU and RAM. Would this work out?
The case is a Cooler Master Elite 430, and here is a diagram to illustrate things:
So at the "Rear 120mm" point, I plan to put the fan as an exhaust. Alternatively, would it be better placed at the top over the CPU or RAM as an exhaust?
Finally, is it even worth getting extra fans? I read that it can drastically lower temperatures of all components if places in good places.
With the open top that case has, you may not even need a top fan. Natural convection will draw heat out the top. And a front intake fan, rear exhaust fan is usually sufficient for stock systems.
If you decide to put 1 or more top fans in, yes have them exhaust. If you have room for a 120mm fan in the floor, have it intake along with the front fan. That will create nice airflow from front/bottom over the card/processor and out the top/back.
A front and rear fan would be the best, yes. It creates air flow that way. Filters are only desirable on intakes, not exhaust. There's no reason to filter the air leaving the case. If your top vents have no filter, just open the case occasionally and blow it out with a gentle blast of canned air.
Okay. I will buy one Sharkoon fan and install it as an exhaust at the rear now. I just wanted to make sure I don't make some sort of error that will mess up the air flow completely and do harm rather than good.