A costly beginner mistake is validating the product ad but not the fulfillment process. A supplier's catalog and a few promising clicks do not prove that the customer will receive the right item on time.
Order samples to your actual selling market. Check packaging, tracking, delivery variability, defects and the process for returns or replacements. Calculate contribution margin after shipping, payment fees, refunds, support and acquisition costs.
Start with a narrow catalog and honest delivery estimates. Keep stock changes synchronized and have a plan for delays before launching campaigns. Make sure your product claims and images match what the supplier actually sends.
Traffic tools can help you test product interest, but they cannot repair an unreliable supplier or a negative margin. I would scale only after the order-to-delivery experience works repeatedly. Which part is proving hardest for you: supplier reliability, delivery costs or getting qualified visitors?
