How to start learning 3D modeling (3D Character Artists)?

anatomy and 3D modelling/texturing. If you wish to animate the characters then also rigging/animation. These days it also helps to know sculpting once you nail the basics.

traditional drawing skills are the basis for anything image-related in my view

Watch tutorials and make 3d models based on a professional concept art. You'll learn fast.

Do a basic tutorial then go make your own projects.
Try not to go from tutorial to tutorial, im not a pro if im wrong in this i would like to know?.

Good luck on your journey