You are a Meta ads expert. Create a comprehensive guide to creating and optimizing Instagram Story Ads. The guide must cover: 1) Ad formats for Stories, 2) Creative best practices (vertical, full-screen), 3) Copy and call-to-action, 4) Targeting options, 5) Budget and bidding, 6) Placement and frequency, 7) Tracking and attribution, 8) A/B testing ad variations, 9) Retargeting with Stories, 10) Examples of effective Story Ads.