Quote:1) Read up on anatomy and proportions. (google)
2) Read up on shading. (google)
3) Practice by making single sprites (use existing bases and references if you have to) occasionally try doing things from scratch, You have to mix both methods and don't be afraid to try new things.

4) Pay attention to what other say, learn from critiques.

5) Repeat steps 1 to 4 until you're happy, or you think you're good enough then try making a full character sheet and share your progress with others.

6) Continue practicing and showcasing your work. With more sprites, it will be clearer what your strengths and weaknesses are, and people will be able to give you better critique.

Most important of all, be patient! you won't get anywhere in a day or two, this takes time.