I wanted to ask if a self-made PC with these components is good for Fortnite and if the components all work well together!
PS: Do I actually need the Be quiet fan for the CPU?
To say how good the config is you have to know how much it costs.
If you take an extra cpu cooler, do not take the be quiet but a Alpenföhn Advance. You can also let blow it backwards, of course
500 watts are more than sufficient
Can you do that?
You do not need the CPU cooler, but it does not hurt in terms of volume and temperature.
But would take another CPU cooler, the BeQuiet can only mount horizontally.
eg the Ben Nevis (Advanced)
Basically, the boxed cooler of AMD is sufficient if you do not want to overclock.
The only drawback with the AMD Boxed cooler is the "heat paste" under the cooler, because this pretty much "sticks" on duration. Since I would recommend you just clear the paste and instead the MX4 for 5.- extra to buy and apply this.
The be quiet cooler I would recommend you though if you have before overclock your CPU.
Otherwise, I would possibly recommend an ATX instead of a mATX motherboard, because the cooling is harder because of the small format.
If the monitor Freesync supports, I would recommend you possibly to switch to an AMD graphics card. Either a Vega56 or a RX 580, but that's a matter of taste.
If you say that you do not care about Tearing, stay with the Geforce.
A 400watt power supply would also be perfectly sufficient if you have to overclock.
But you can keep the 600watt power supply in there, if you plan to upgrade to components that use more power.
There are also vlt nen cheaper cooler for about 20 euro