Some more things to add to the other post plus this one , because they are very similar. -
Start with a plan.
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Concept arts of characters.
Remember to break them down into simple shapes. -
Story outlines.
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Use a giant amount of references.
Here is some wonderful tutorials that helped me. -
https://www.blendernation.com/tag/series-rico-cilliers-3d-characters/
https://www.artstation.com/mccabe86/albums/63796
And if you plan on making stories , Celtx and WriterDuet are great for scripts and such.
Keep practicing , and rest when everything is overwhelming.
Can’t wait to see you succeed !