Question just built this

Dec 22, 2019
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so i just built this computer with a new motherboard, new cpu new SSD, everything new pretty much

whats the first thing i gotta do, install the OS then the graphic drivers?

motherboard: msi mpg x570 gaming edge wifi
cpu: amd ryzen 7 3700X
gpu: msi geforce rtx 2070 super ventus
psu: 1200 corsair
SSD: 1TB samsung evo 800 something i forgot
case: TT 71tg