How do I create a product to sell online?

There are a number of things you could try. Acquiring ready made goods at wholesale/bulk prices to resell for profit. You could also try offering a service for sale, soemthing you can do that people would pay for,for example: creating quality low cost wedding stationary, or hiring out your car, etc. You could try and make something, for example personalised christmas baubles for the tree to sell, or outdoor setting. It depends what skills you have s to what you can provide and sell to make a profit. What are you interested in?