If you're thinking of building your PC yourself, I recommend using https://pcpartpicker.com/ to help you with that. This site lets you pick compatible parts so you don't run into compatibility problems, and it will also tally up all the costs so you can get a rough idea.
But if you're thinking of getting a prebuilt one remember that the graphics card is the most important thing for modern gaming. Also, try to not get ripped off by scalpers on eBay that charge 2X or 3X for the price of components since the shortage.
Good luck to you!