Build an APP

I would like to create an app that offers Art and street-wear clothing, especially for Saudi Clothing Brands. Which will have the opportunity to contract with Saudi brands post, marketing & sell for them. The market there is just a few people specialized in Saudi Apps, I wanna be unique and get the app easy to use for all ages and genders. Please contact me for additional info and to build it with both side ideas. This would be a start-up, so would need recommendation from your experties and experiences.