Most inventors can’t afford the thousands, if not millions, of dollars it costs to bring their own products to market. However, once you have a patent, you can get it to market by shopping around for investors, selling your patent or licensing its use to manufacturers.
The cost of bringing a product to market depends on:
What the product is
How much you spend on design and development
How much you spend on prototypes
How much it costs to manufacture
Whether you need any certifications
How large you want your initial run to be