You can run market tests to decide what product(s) to order from your manufacturer's catalog. If you are deciding between certain designs, colors, and finishes, it's best to sample the consumer market and see what they would actually be willing to buy before you spend a dime on ordering inventory.
Questions you could ask:
"If you were shopping for this product, which color would you be most likely to purchase?"
"Would you purchase this product if it was offered in a different finish/material? Which would you prefer the most?"
"What types of products do you purchase regularly online (home decor, apparel/clothing, kitchen, sports/things for kids, etc.)?"