Research about a case that works for you. Some like a Lian Li case, some like a Fractal Design case, a few like a be quiet! or Corsair case, or NZXT case, look at different options. Then, an x870-E motherboard, maybe a Gigabyte Master or ASRock Taichi, Ryzen 9950x processor, 64GB RAM, and a RTX 5090.
All games should be made for PC first since all games are developed on PC. After the development is finished and stable on PC for release, then they can port it to console.