Digital Marketing and Sales for U.S. Market

I need someone to help us in our expansion to the U.S. market. Specifically I need someone to preform digital marketing and sales tasks including prospecting, making calls, creating marketing materials and assisting in building of the strategy to expand to the U.S. In addition to this I need help to build the brand in the U.S. market by creating a network and showing our expertise on customer loyalty by responding on Social Networks like Linkedin groups, Quora, etc. This person would ideally have experience in digital marketing and sales. I prefer someone from the U.S. for the job.