As per your requirement of the video, there are several steps that has be followed to complete an animation video.
1st part is 2D part , would include :
1. 2D storyboarding and animatics with audio.
2. Character design with colorkey
3. Set design with colorkey
Next comes 3D part which includes :
1. Asset design - Set and character modelling , texturing and rigging.
2. 3D Animation.
3. Lighting, Rendering and Compositing
And last is the Editing part.
Prices for the same are as follows :
Asset design - 2K per Prop , 4K per set , 6K per character
3D Animation - 800 per second
Lighting Rendering and Compositing - 3k/second
Editing - 10k
If there will be any extra requirement for increasing video quality then prices may vary.