One advantage of using index cards in this way is that they allow you to easily rearrange scenes and consider how the story might unfold if told in a different way. Writing out scenes on cards can also reveal which ones are extraneous. With each scene, you should consider a couple of questions:
- What does the scene do?
- What questions are raised by the scene?
Want to write a novel? You could sit down and start writing, however for many writers this leads straight to procrastination, and deciding that they're just not "inspired", and giving up.
Professional writers sneak up on long projects. They make notes for days, weeks, and sometimes months, before they're ready to write.
Take your time as you plan. Once you start writing your novel, start planning the next.