get an old dell latitude or thinkpad. They’re good performing laptops for the price you pay (somewhere around 50-100 usd) and the hardware’s old enough that any built in peripherals such as a microphone, webcam, or trackpad should just work. As for a distro, it depends. If you don’t want to learn anything or a bare minimum amount about your computer to use it, use linux mint*. If you want the freedom to turn your desktop into anything you want and don’t mind learning a thing or two, use arch.

*xfce will perform the best, but any version will work just fine.