First of all, it's not really that great to build a PC without any knowledge, you should at least know the basics, otherwise you will most likely fail. It isn't the greatest time as well, because you can't really get any good GPUs for less than 1000 CHF, thats why I would recommend you the Intel i5-11600k, it has onboard-graphics, which you can use until the GPU-market is "normal" again. Ryzen CPUs are mostly rated better by many gamers, but you won't have any graphics until you buy a GPU.https://www.digitec.ch/en/s1/product/intel-core-i5-11600k-lga-1200-390ghz-6-core-processors-14715795
Therefore the MSI MPG Z490 Gaming Plus is a decent motherboard, pretty good price value. The mainboard isn't really effecting your gaming performance though.https://www.digitec.ch/en/s1/product/msi-mpg-z490-gaming-plus-lga-1200-intel-z490-atx-motherboards-13092743
Storagewise I would recommend a 1TB M.2 SSD for now. You've got some space for games and they will load really fast (as well as the OS. If you want more storage later, you can buy a SATA-SSD or even a HDD (cheap price, slower than SSDs) and plug it into your PC. Samsung makes really good SSDs.https://www.digitec.ch/en/s1/product/samsung-970-evo-plus-1000gb-m2-2280-ssd-10339166
As memory, I would recommend the typical amount, 16GB with 3200MHz, no issues in performance whatsoever. Price value is really good with HyperX-Fury RAM.https://www.digitec.ch/en/s1/product/hyperx-fury-2x-8gb-ddr4-3200-dimm-288-memory-11841791
For CPU cooling, Intel isn't known for delivering good products, so I would recommend you buy a aftermarket CPU cooler, like the Pure Rock Slim. Should be much more quiet and even more cooling than Intel's stock cooler. (Not really necessary though)https://www.digitec.ch/en/s1/product/be-quiet-pure-rock-slim-1248cm-cpu-coolers-5895901
As for the PSU, I would recommend at least getting one with the 80 Plus Gold or higher certificate, mainly to save some power as well. I'd recommend you get at least 850W, so in the future, when you get a decent GPU, you're fine for years. https://www.digitec.ch/en/s1/product/corsair-rm850-2019-850w-power-supply-computer-11245271
Lastly we got the case, that's based on preferences, but a good price value would be the Pure Base 500 DX from be quiet!
Good cooling, decent I/O, what do you want more?https://www.digitec.ch/en/s1/product/be-quiet-pure-base-500dx-midi-tower-pc-cases-13168983
So the total will be about 990 CHF but without a GPU, you'd have to double your budget to get a decent one.
I'm free for any remarks by fellow Digitec users, my recommendation is based on personal preferences.