creating banners for marketing

I'm looking for a skilled freelancer to create some eye-catching banners for product promotion. I'm not sure what size of banners I need, so I'd like some advice on which dimensions to use. The purpose of the banners should be to increase public awareness of the product. Color and design-wise, I'm open to ideas – surprise me with your creative talents! If you feel you have the skills needed to produce high-quality banners that can help promote my product, please get in touch.