Social Media Marketing Facebook, Twitter, LinkedIn, B2B Sales Lead Generation

I am looking for someone to generate inbound calls using social media marketing for my business. Facebook, Google Plus, LinkedIn, Twitter, any way possible as long as we generate leads for my business. I would like to generate phone calls to my business with this type of marketing. This would involve total campaign design through implementation and require experts in social media marketing. This would be open for long term work as we would need someone to continue to maintain all the social media channels. This can be a set monthly rate or hourly. I need to know a bit more about your strategy before hiring.