People have told me that they want to write a book 
but don't know how to get started. They are always 
surprised by my advice and how easy it sounds.

Just write and don't stop! It really is that easy.

Keep going forward and don't look back. Looking 
back at what you wrote is the kiss of death. 
Writers call it "editing block", meaning you will 
be trapped in the edit mode and never get out of 
it to continue writing your story.

You'll have time to do editing on your second rewrite 
and third rewrite. Judging your words before you are 
finished with the first draft truly is the worst thing you 
could do. Don't worry about being perfect or holes in 
your story on the first draft. You can fix it on the 
second and third draft. Your goal should be to get 
the story written first, this needs to be your number 
one priority.

At some point during your writing you will begin thinking 
that your story is no good and that you should just quit. 
Don't give in, keep going forward. Try to write everyday, 
keep the topic fresh in your head, touch your story 
everyday even if only for a few minutes.