Hello
@Nikephoros !
You will need a physical green screen which can be either bought or created out of material. Depending on the size of the green screen, there are multiple options. I use a green screen for a TV Talk Show and for this purpose, for me Elgato green screen is enough. It's like a roll-up and can be carried and assembled anywhere.
Then, in the editing program, you use the chroma key. What is the size of the green screen that you need?
Also, lighting is very important. Shadows can impact the result so you want to counter them as much as you can