Colocating for the first time. What do I need to know?

Since Google is getting rid of my unlimited Gdrive and my home internet options are all capped at 20 megabits up, I have resorted to colocating my 125 terabyte Plex server currently sitting in my basement. Right now it is in a Fractal Define 7 XL, but I have order a Supermicro 826 2U chassis to swap everything over to....