As you experiment with both Blender and drawing, there will be some realizations that you will realize and start working towards. First, blender only knows how to make straight lines. It doesn’t do curves with each edge. So by drawing things as straight lines, you can create drawings that should allow you to easily transfer your characters from a 2d screen to a 3d screen.
And once you master characters, environments can be similarly changed into the same kinds of line art and recreated in Blender as well - just bring in a picture and then start modelling each component based upon lines you see in the picture.