I'm assuming that you're trying to do this fairly cheap since you're trying to get individuals to work from home. However, if you want to consider handling it professionally PM me. I am the Manager at ProCom Inc. in Lamoni IA. We are a full-service Call Center and have done all kinds of sales, Customer Service, Lead Generation, Surveys etc. (Not a "Boiler Room") We would be more expensive for you, but the ROI would likely be much better.
http://www.procom-inc.com/
If you hire a private individual make sure they know the ins and outs of all the State and Federal Laws.