For keyboard you should try to get chance to test different switches.
If you've only used cheap membrane/rubber dome switch keyboards, mechanical switches differ vastly in their behaviour and feel.
In fact's there are even notable differences between different mechanical switches.
Though one thing is common for them:
All of them are noisier, because of having lot more moving parts (made from hard non-elastic materials) banging into each others.
Also keyboard profiles are usually high.
So if you like thinner, lower profile keyboard, there aren't much of mechanical switch choises.
For no experience user I would recommend "non-linear" switch:
Those have light initial travel, but bump in necessary force before switch reaches actuation and then low bottom keeping resistance.
Linear switch with decent feel before actuation point hace stronger bottoming force, while lighter bottoming force linear switch doesn't have much initial resistance.
That makes it less easy top avoid accidental key presses...
And you if you have to start consciously thinking about that and stressing fingers against that, your key pressing speed is certain to suffer lot.
Besides it being distraction from game:
Ideally you don't have to think it at all when you rest finger on key waiting for moment to press.
Also if you would like to avoid unnecessary noise there aren't much of options.
Most of the mechanical switches simply fail to give damn about noise.
Some even add extra noise effect for mechanical typewriter like ruckus.
Logitech's Omron made Romer-G is one of the rare switches with some damping for noise from ends of travel and has non-linear force curve.
https://www.overclockers.co.uk/logi...cal-gaming-keyboard-920-008017-kb-259-lg.html
Cherry has also one in MX line, but's its light linear switch and could be hard to get used to.
For actually low profile mechanical switch Logitech has one new in G815 and G915 keyboards.
For mouse lot depends on your hand size and own preferences.
Though guess something like Logitech MX518 would be classic.
If you don't need microphone scrap term headset completely, which is used to sell gaming profit margin cheap Chinese productions.
And if you have quiet environment gaming stuff's usual design leaves lot to desire:
Open ear cup design doesn't isolate heat as much as closed design and causes less sweating.
Closed design needed for noise isolation in noisier environment isolates also more heat, especially if ear pads aren't breathing fabric/velour.
(also harder to balance for getting as accurate sound)
Anyway you can easily mod basically any headphone easily into headset with ModMic.
Good for gaming headphones from actual audio makers aren't even expensive.
I assume you would like good balance between "fun factor" aka bass and details.
For open design Beyerdynamic DT990 does that well.
Studio use aimed £100 Pro version has coiled cable, normal Edition has straight cable for couple dizens higher price.
For closed design DT770 does very well for closed design of its price. (80 ohm version comes with straight cable)
Also Beyer's replacement ear pads (those get dirty and wear) are vailable for very reasonable price.
So they're easy to keep going, unlike good luck for finding parts disposable gaming trinkets.
Other part of headphone gaming immersion is binaural sound signal:
We hear in 3D, because shape of the head (+pinnae) causes direction dependant changes to signal received by both ears from sound source.
Properly recorded or processed two channel signal can contain those spatial cues and when reproduced accurately enough can give very good immersion.
Most sound cards have had some kind algorithm (called HRTF) for modeling that for about 15 years.
Though despite of very hyped name for example Dolby Heaphone is far from good.
Creative has good binaural simulation algorithm and nowadays very good headphone outputs.
If you want internal sound card Sound BlasterX AE-5 is very well balanced.
For external USB sound card with direct control for disabling/enabling processing and volume, Sound BlasterX G6 is tech wise pretty equal.
https://www.overclockers.co.uk/crea...aming-sound-card-70sb174000000-sc-104-cl.html
https://www.overclockers.co.uk/crea...-sound-card-pc-ps4-xbox-switch-sc-107-cl.html
