Building Startup Sales Teams

Working out sales strategy has turned out to be the most difficult thing for our startup for precisely this reason - none of us are sales people! My partner and I are both very introverted, and although we have a great product (i think), we're having a hell of a time with PR, marketing and sales.

Laundry lists like in the linked post are useful to reflect upon, but don't give great specifics. I think that sales is a very human skill and undertaking, and it may be something you have or don't have.

Does anyone have any resources that have helped them learn?