1. ryzen is picky about ram.
Pick a 2 x 4gb kit from the motherboard qvl support list:
https://dlcdnets.asus.com/pub/ASUS/mb/SocketAM4/PRIME_A320M-E/Memory-QVL-For-AMD-Ryzen-2000-Series-processors.PDF
Faster is better.
2. 450w is fine, but corsair vs is tier 5/6 low quality on this list:
https://linustechtips.com/main/topic/631048-psu-tier-list-updated/
Seasonic is always good.
3. Stock cooler is fine.
4.
I will never again build without a ssd for the "C" drive. It makes everything you do much quicker.
120gb is minimum, it will hold the os and a handful of games.
But, many things default to the "C" drive.
When a SSD nears full, it will lose performance and endurance.
240gb is the recommended minimum.
If you can go 240gb, or 500gb you may never need a hard drive.
You can defer on the hard drive unless you need to store large files such as video's.
It is easy to add a hard drive later.
Samsung EVO is a good choice for performance and reliability.
For a first time builder:
MY build process:
Before anything, while waiting for your parts to be delivered, download
and read, cover to cover your case and motherboard manual.
Buy a #2 magnetic tip Philips screwdriver.
1. I assemble the critical parts outside of the case.
That lets me test them for functionality easily.
A wood table or cardboard is fine.
2. Plug in only the necessary parts at first. Ram, cpu, cooler, psu.
Do not force anything. Parts fit only one way.
Attach a monitor to the integrated motherboard adapter.
3. If your motherboard does not have a PWR button, momentarily touch the two pwr front panel pins with a flat blade screwdriver.
4. Repeatedly hit F2 or DEL, and that should get you into the bios display.
5. Boot from a cd or usb stick with memtest86 on it. memtest will exercise your ram and cpu functionality.
6. Install windows.
7. Install the motherboard cd drivers. Particularly the lan drivers so you can access the internet.
Do not select the easy install option, or you will get a bunch of utilities and trialware that you don't want. Drivers only.
8. Connect to the internet and install an antivirus program. Microsoft security essentials is free, easy, and unobtrusive.
9. Update windows to currency.
10. Only now do I take apart what I need to and install it in the case.
11. Now is the time to reinstall your graphics card.