I have written three books, one is currently published.

Honestly, the best tip I have ever been given was from a teacher in the 11th grade who said "If you want to write something, just write it. Don't look back and fix anything, that's what editing is for."

I used to get so caught up in my own writing and worrying about continuity (one of my books is me essentially sharing the loss of my brother, and you can mess up your own time line oh god can you) that I would just cease writing all together due to frustration. Once I pushed that out of my head and did marathon writing, I actually got the story out. And it made editing a hell of a lot easier.

I think one website that is fantastic at getting people to start writing is National Novel Writing Month. In November is the main month, where you essentially write a novel in one month. They also do "camps" through out the year where you write novels/short stories/dissertations/anything. It is an extremely helpful website because not only do you have incentive to reach your writing goals (you have to hit or go above a certain word count a day), you have access to forums with a plethora of information and facts that you can ask from others, writing tips from authors, etc.

Good luck!