Low Poly Animation sequence tutorial

Hi,

I am somewhat experienced in modelling, but i’m a beginner in Animation.
I’m looking for a tutorial which explains how to make a video like in this video (Target Video).

I have seen video’s which explain how to create Low Poly models and animate them like this tutorial. But all of those tutorials animate a single object/scene. What i’m looking for is to Animate multiple scenes and have a smooth transition in between them. Like its shown in the Target video above, all the objects pop-up when they appear and pop-down when they disappear.

Is this all done in one single model/file? If yes, are they all modeled in the same place and animated to appear and disappear?