A Noob trying to learn how to build a fighting setup

Making a game in the same kind of style as Guilty Gear ST. When I was looking up fighting camera there was a short that explain how the worked, here the link https://www.youtube.com/shorts/c3mJ9knH9l8?feature=share.
I need help setting up a 3D in a 2D style fighting game setup with two characters, left and right scrolling camera, and walls on both sides.

I don’t know what proper direction I should go to get the results I need. I’m really bad that explain what I’m looking for but if you have any questions please let me know.