I switched from PS4 to PC back during ARR. You can keep using your PS4 controller if you want. It works great on PC as well. I used my PS4 controller for quite some time before eventually getting an XB1 wireless controller which I use currently for gaming on PC. If you do want to use a mouse and keyboard though I would highly recommend buying a MMO mouse with a bunch of buttons on the side. That way you don't need to contort your fingers into unnatural positions.