Virtual Backgrounds : Quick Start (tutorial) | virtualstudiosets.com
A quick look at the ready-made virtual backgrounds that are included with all the virtual set packs (PNG format) at https://virtualstudiosets.com
All or main studio sets include at least one complete background layer for each camera angle that you can drop behind your green screen footage in pretty much any software package.
The 'Photoshop/PNG' packs also include many more layers to play with, but you're guaranteed to get at least one 'easy start' virtual background.