I've never written an outline or a bio or anything like that and I've done pretty well so far.
Personally, I find that if you start getting too technical during your writing process, you can kill your creative flow.
When I'm writing, I have an idea about what the general story will be, then start writing. What happens is that I'm suddenly surprised by what I'm creating and the story writes itself. When I take a break and go back and read what I wrote, I get that 'wow' moment; did I really just write that?!
The story should flow naturally from you. That's my two cents worth anyway