Does this writing requires that you publish it somewhere or can it be really private?
>Blog. You can write in a journal or text document just for yourself, but I highly recommend blogging. Get a free account at WordPress.com or Tumblr, and just start. Why blog? Because it really helps you to write regularly, and forces you to think in different ways, when you have an audience. Even if the audience is small. It’s scary, I know, but just do it. You’ll grow comfortable with it over time, and you should never let fear stop you from doing something amazing.
The benefits grow, however, when you write publicly. Consider this: when you write publicly and share it (even if it's just with friends or family) you're likely to get feedback about what you've written and how you written it.