What is the best CPU to pair with an RTX 5090?

What processor should I buy to go with the RTX 5090 card that is coming out soon? I am trying to build my very first gaming computer and I want it to be the fastest possible because I am finally moving out of my parents house in Seattle and I want to treat myself before I start my new office job in December. My budget is pretty high like maybe $4000 total for everything but I really have no clue what I am doing and all these numbers for parts are so confusing like i5 or i7 or i9 or those Ryzen things.

I heard the 5090 is gonna be the fastest thing ever so I do not want the other parts to slow it down or whatever people mean when they talk about bottlenecking. I am really scared I will buy something that does not even fit or work together because I am totally new at this. Is there one specific chip that everyone agrees is the best one or does it depend on other stuff? I mostly want to play that new flight simulator game on a giant screen. Sorry if this is a really basic thing to ask I just dont want to waste money on the wrong thing since I need to buy everything in the next two weeks before I move...