read a lot and write a lot."
The key to being successful in any of the artistic endeavors is practice. If you want to be a writer, then write every day. Write thousands upon thousands of words. Spend more time writing than rewriting. Keep creating day in and day out. Also read every day. Read and study other authors.
If you want to be a painter, then paint every day. Draw thousands of pictures. Paint thousands of pictures. Success comes from practice. And study the paintings of other painters. Study the masters. Visit the art museums.
For most of us, the practice of our chosen craft does not come easy. We must practice, practice and practice.
Here is Stephen King talking about writing.