I've been doing online marketing for over 9 years and have helped a lot of people/companies bring in sales.

Start with figuring out your target customer. What problems are they having? What blogs to they read? What events do they like to go to? What kind of education do they have? How old are they. The more specific you get, the easier it will be to direct targeted ads to that core target customer. These are the people that will take the least amount to "sell" before they pull the trigger.

Next set up ads on platforms like FB, Instagram, Etc. targeting your core customer to get them to your sales page.

Have you already built up inventory? As you know, the hard part about building physical product companies is they require a lot of capital outlay to build up inventory. A good way to work around this is do a crowdfunding campaign on Kickstarter or a related platform. It will help bring in capital to work with, and more importantly, prove there is a market for your product before risking all your money.

Let me know if you'd like to go more into detail with how this relates to your specific product.