That shows a real writer at work. How do you get something started? Get something interesting on the page, and then hopefully you work from there. When you’re starting that way, you don’t have any expectation that that’s what you’re going to be putting on the screen. Well, in that case it was, or at least a version of it was. But you have to understand that everything you do along the way is a tool toward achieving a product. If it fits in the box of what you’re trying to make, it stays. If it doesn’t, then you should happily throw it away.