The creation of two main buildings for the first episode and filling their interiors.
At this stage preparation can be considered complete. The next step is to create a storyboard (editing a scene according to the storyboard) and animation.
P.S. Yes, I know that the storyboard is done FIRST, and then scenes are created based on it, but so far I have everything in my head and I was sure that I needed such an environment. Further I will do according to the rules: storyboard -> scene -> animation.