Some thoughts for you:
Buy the best monitor that you feel you can afford. A monitor will last a very long time.
4k monitors are reasonably priced. See it in person if you can.
Otherwise, go to rtings.com for reviews.
Do not go overboard on fast graphics cards, at least not initially.
Integrated graphics is fine for desk work, HD movie playback and easy games.
Buy a strong psu to be able to handle a future high powered graphics card. 750-850w will do for most.
The psu will only use the power demanded of it, regardless of the max capability.
A quality psu will have at least a 7 year warranty, perhaps 10 or 12.
Processors from either Intel or AMD will have comparable price/performance.
Many on this site are gamers and will tout the amd X3d models for gaming.
But, more conventional processors are better for general use.
Intel I5-14500 might be a good candidate at $240 or so.
AMD R5-7600 at $ 200 might be comparable.
Buy all the ram you might ever need up front. Adding ram later may not work well.
Ram must be matched in a single kit.
2 x 16gb will be about $85.
FWIW:
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 long #2 magnetic tip philips screwdriver.
A small led flashlight is also useful.
I find it handy to buy a power switch like this for testing.
https://www.newegg.com/p/N82E16812119009?Description=power switch&cm_re=power_switch-_-12-119-009-_-Product&quicklink=true
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 if you have one, otherwise to the graphics card.
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.
They boot from a usb stick and do not use windows.
You can download them here:
MemTest86 is the original self booting memory testing software for x86 and ARM computers. Supporting both BIOS and UEFI, with options to boot from USB.
www.memtest86.com
Memtest86+ is an advanced, free, open-source, stand-alone memory tester for 32- and 64-bit computers (UEFI & BIOS supported)
www.memtest.org
If you can run a full pass with NO errors, your ram should be ok.
Running several more passes will sometimes uncover an issue, but it takes more time.
Probably not worth it unless you really suspect a ram issue.
Opinions vary on updating the bios.
Normally, one does not update a bios unless there is a fix for something that is impacting you. I violate this rule on a new build and will update to currency up front.
Use the usb option, not the windows option.
If there is a severe problem, the impact is small.
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.
7. Connect to the internet and install an antivirus program. Microsoft defender is free, easy, and unobtrusive.
8. Install your graphics card and driver if you tested with integrated graphics.
You will need to remove the graphics card later to install your motherboard in the case.
As a tip when screwing the motherboard into the posts, give the screw a small counterclockwise turn until you feel a click.
That lets you know that the screw will engage properly.
Make a note of how the graphics card latches into the pcie slot.
The mechanism will be hidden under the card and may be difficult to work if you have not previously checked how.
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.