If I started today, with building a server, I'd jump right into verified set-ups and writeups, like this one:
https://github.com/noonghunna/club-3090
You can find info about running a patched version of vllm for 1x24gb, 2x and 4x. There's also quite a few "blackwell" subreddits, where people seem to share a lot of substantial information, if you're going the 6000 route.