I think you answered your own question, but I'll repeat your answer: Go to the library / bookstore and start learning about sales (and to a lesser degree marketing).
Without someone in the company having some idea of sales or marketing, odds are your company won't grow.
Sales generally takes more time to develop than most non-sales people think. Even if you know your field well, odds are you don't know how to develop a sales strategy, or how to implement one that's been planned. Consider hiring for the skills you lack; but, remember that your sales personnel can have undue influence over the company if you lack basic knowledge of your company's most important department (so you'll have to learn it anyway).
Lots of good products become bad products just as soon as it becomes apparent that they will be difficult, if not impossible, to sale. A product that won't sale is a good solution to a problem that people don't see the value in fixing.
Don't take the "Field of Dreams" approach, "If you build it, they will come." as odds are they'll never even hear about your product.