A website can come later. A gallery can start working now.
A full website is useful for your brand, portfolio and long-term presence, but it is not always the best first step for selling prints. The first step is usually much smaller: choose a collection of images, present them beautifully and make it easy for someone to order.
That is why gallery-based selling works so well. The gallery is already where people are looking at the images. It might be a wedding gallery, portrait shoot, travel collection, local landscape series or personal project. If the store is built into that same viewing experience, the sale feels much more natural.
This removes a lot of the pressure. You do not need to design an entire ecommerce site before you begin. You need one strong gallery, a clear print offer and a simple way for people to buy.