If you're going to be investing in an in-house employee, then don't hire sales based on commission. a) Pay them a low base salary that's fair and means they don't have to struggle to pay the rent (you don't want desperate salespeople, because it increases the chances they won't treat prospects they way you want). Again, you don't want them selling the wrong product. They need time to ramp up and learn your product. Give them the proper tools, time, and training.

The other route you can go with in the beginning is outsourcing your sales to a company like http://inspirebeats.com With InspireBeats, you can get all the value of a sales rep for a fraction of the price without the need to train them. InspireBeats can help you do the list building, lead research, as well as personalized outreach, so that you only deal with qualified and targeted leads.