i need character animation using blender

I have made a remake of a classic song and want a new video to go with it, I've used the video of the original here but would like a modern take it but with the core theme of a boy flying with a snowman and following lyrics - eg flying over a village when it mentions, and a whale when it mentions monster in deep etc like original but can feature other general christmas animation too.

https://youtu.be/o4dJh6H8yK4

That the reference 2d video I share then, now I say I want it in 3d quality like this video

https://youtu.be/A6QJk4YJahI