Before hiring your next great sales professional, you must decide if you are in a willing to make a commitment to training, developing and managing them. If you're not in that position, do everyone a favor - don't hire them.
Sales professionals aren't robots you wind up and send out the door to simply sell stuff. If it were only so easy. Like everyone else in your organization they need to be managed, developed, and educated. In when is next sale have to know the product offering, the sales process, the target market, the messaging, metrics, expectations, and management program. If you don't have an excellent handle on these aspects is likely to business, what makes you imagine that any sales person only will figure it out and be successful? Being an experience has demonstrated over and over, they won't.