I was recently recently looking through Nikki Giovanni's collection, Acolytes. In one brief piece, she states that there is really only one thing a new writer needs to know, and that is who they are writing to please. The rest will come. Giovanni explains that she writes for her ancestors, who endured slavery and hardship, for family and friends in the American Civil Rights struggle, and for those women who raised and instructed her; she writes, and does so in a manner that she believes will make them proud.
What's your motivation? Who are you writing for?