For new Amazon sellers, the quantity of the first batch should be determined based on market demand and sales expectations. Generally speaking, it is recommended that new sellers test the market on a small scale first to understand the popularity and sales of the product before restocking.

You can choose a small amount of inventory at the beginning, such as 50-100 pieces, and then gradually increase the inventory based on market feedback and sales. This can reduce risks and inventory backlogs, while also better understanding the product's market performance and sales trends, providing a reference for subsequent business decisions.