Hi Paakman, sounds like an interesting product when you say that customers can injure themselves - is it lawn-darts? :)
So there are a few things you can do, as a startup you probably qualify for a Business Owners Policy (referred to as a BOP) and that will include some product liability coverage, which is what you want. Depending on the scale/danger of the product, you may want to opt for more product liability coverage on top of the BOP.
Also, with the BOP you'll get things like basic liability protection for you, your employees and your property.
And depending on your product, you may also want to get professional liability coverage, which would cover you from errors or negligence on your part -- if it could be argued that you were negligent for selling flamethrowers to teenagers, for example.
If you have other questions, we posted a quick FAQ on small business insurance on our blog.
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How much would
liability insurance cost for your startup or small business?