If you doing this right your pen should never leave the page. Let your pen go wild. Later you can go back and circle any parts you want to use. You will probably find that some of these ideas work better than others. You will have to try them out and see which ones work best for you.
Many young writers think of revision as all hard work and drudgery.
But revision is more than just a way to fix a broken piece of writing. It's also a way to honor a good piece and make it even better. You might try sound effects, or an intriguing first sentence. Revise for voice. Change the order.