How many product reviews do you have when you start a new store?

You do need some good reviews to sell your products, but there's no fixed number. It's all about quality reviews. Offer discounts and run promotional campaigns initially to get some good reviews. Give your best in terms of product quality, pricing, delivery, and customer experience. Consequently, you'll build your trust with customers real soon.

I like to be ready for anything, so more than half of the descriptions of the products I sell I had when I started a new store.