For the novice artist, follow the following by creating a character using shapes with the following instructions
https://creativecloud.adobe.com/learn/animate/web/drawing-in-animate-cc
If you are more of a sketcher, then grab one of the drawing tablets and use the brush tool to create a character
https://creativecloud.adobe.com/learn/animate/web/drawing-with-brush-tool
Next, check out how to create your own line profiles
https://creativecloud.adobe.com/learn/animate/web/draw-animate-variable-width-strokes