First time building a gaming pc need help

Hello, I’m building my first gaming pc and need your help on the subject. My range is 2200-2500$. Already got a 4k tv and monitor oled.

I need help on all the components, 4k or 1440p performance, rgb or not…

Most important part is minimal noise and cooling system I think to make it durable

And should I build it or buy a completr one already