There are many books and classes you can take to develop these skills. Since you will be enthusiastic about your product, learning to sell it might not present many problems. However, some sales techniques are more successful than others. You will be doing many different jobs for your business. It is helpful to forget the idea of self-promotion.
Some people are uncomfortable about the idea of promoting themselves.
You are promoting a product. You are not promoting yourself. You are seeking the right audience who knows how to appreciate the opportunity to invest in your product. You also have confidence that the right audience is out there. You just have to find it.