@whynotsim The monitor looks fine on paper, although it is a bit dimmer than I'd expect: 250 nits is standard for VA panels but a little low for IPS. Still, it could be perfectly fine for your needs; the only way to know is to test it out. I'm not familiar with the brand at all, which isn't necessarily a bad thing, but I'd suggest inspecting the monitor very closely and returning it if you notice any problems. Even one dead pixel out of the box is a reason for returning it—one now could mean more coming in the future.
Keep in mind that you can also calibrate the monitor to your preferences if you're not totally thrilled with how it looks out of the box. The online guides for this do a better job than I could, so find one that works for you and try out some settings. This really is more about subjective experience than anything else, so take your time and choose what works for you. There's no one right answer.
For the keyboard and mouse, they're almost universally compatible just like monitors are. The right answers are what feel good under your fingertips. A high-quality keyboard can easily cost over $100, but you don't need one of those. On the other hand, cheap keyboards can feel awful to the touch. So I'd suggest either going to a store that has a bunch of keyboards laid out for testing, or trying out some you already have access to, like the ones at work or at your friends' places. A $30 keyboard meant for office work might actually be perfectly fine: it could feel good enough to type with and just be missing the gaming-related bells and whistles that Sims 4 can't use anyway. You don't need to care about response time or macros or RGB lighting.
The same goes for mice: you don't need a gaming mouse with lots of extra thumb buttons and customizable profiles, just something with nice-feeling buttons and that doesn't make your hand cramp during extended use.
