been an artist my whole life, takes lots a practice to get where you want, but when you do, you will find that you can go further.
my best advise is don't give up.
I did this about 5 years ago in pencil.
you should get a set of drawing pencils 2-H,3-H,6-H those are for outlining,2-B,4-B,6-B,are for shading,and thick smooth paper "strathmore" is a good brand.100 weight

Practice,Practice,Practice.
should I say that one more time Practice.