Consultancy for Selling Products on Amazon and E-commerce in the Italian Market

We are a new Italian brand dedicated to skincare products for teenagers and are collaborating with a marketing agency in Italy to promote our brand and products. Currently, we are seeking an expert consultant in Amazon and e-commerce sales who is well-versed in the Italian market. Our main question revolves around whether to sell on a marketplace like Amazon or to focus on our future e-commerce website.