The price you can sell a product at and the best places to sell and promote it will depend on the product itself.
For instance, you might sell a car or furniture in a showroom, but this wouldn’t be appropriate for handmade glove puppets or breakfast cereal.
You might promote a car or breakfast cereal from well-established companies through TV advertising or hoardings but a small new company making handmade glove puppets would be unlikely to have the money to do this, and might advertise in magazines aimed at parents or on the internet instead.