Many who have succeeded in whatever they did, have to admit that they learnt their lessons from others. The same applies, fortunately , to writing as well. If you want to be a writer have a look at this list put together by Richard Nordquist in About.com.
Like any other kind of advice, many of the points look deceptively easy. They are difficult to implement. Knowing these points is only one side of the story. Your ultimate success will depend on your ability to press on doggedly and incorporate these bits of precious advice into your regular writing routine. Speaking about it is one thing. Doing it is that much more difficult.