Better not do that. OLED displays are still not suitable for work. There are two reasons for this. On the one hand you have the problem of burn-in and on the other hand there is text fringing, which can be very unpleasant. Most people don't really like the Curve for office work either, but that's a matter of taste.

No, no extra software necessary. Just check whether your graphics card can handle the resolution of 5140x1440 via the available interface (hdmi/displayport/usb-c).

No, you dont need to install anything. Just make sure youre graphicscard can handle the 5120x1440p over its available interface (hdmi/dp/usb-c)
My pc has hdmi and my laptoo uses usb-c as a displayconnection.