A good prototype gives your product more appeal to investors. First, you can approach friends and family for extra funding, but you may need to approach outside sources to make your product’s production a reality. There are several ways to do this, such as pitching your product to companies, finding investors
through networking, or trying crowdfunding.
Crowdfunding can be done online through sites such as Kickstarter where you showcase your design for pre-purchases.
You can trade equity in your product to sites such as 500 Startups and Y Combinator for an investment.
Contact brand names that would be interested in your product or seek out individual investors and convince them of the success of your idea.