I'd go story-driven for what you're describing. It'll work well for most things in fact. Illustrate how you can solve someones problem.
Have a read of this case study, it'll help you a lot IMHO: Ecommerce Advertising | Facebook, Google, Instagram, Pinterest
Have a read of this case study, it'll help you a lot IMHO: Ecommerce Advertising | Facebook, Google, Instagram, Pinterest