QUALITY OVER QUANTITY
Although this is not true in many cases...focus should be about making better designs versus printing more designs. This is a common mistake and can hurt your product and even worse destroy your brand quick. If you lack the skills necessary to make high quality designs it's better to hire a designer to create unique designs for your brand. Artists can be found via several sites for very competitive prices. Search out some of the sites and study the artists. Find the artists that have the style you need then negotiate with them how you can best work together.
Just keep in mind 1 great design sells more than 10 ugly ones.