after a quick look, this is what you need to learn/do:
Working with Greenscreen / Keying
Working with Lights (General, not only for GS and Key)
You need space, do have distance between the Camera and the Actor.
Picture in Picture technik
At te beginning, there are some 3D thingys... thats maybe Cinema 4D.
You need in depth knowlege about Camera work!!
Thats it for the moment, maybe someone else can say something more...