Digital marketing

I'm interested in hiring a digital marketing specialist to help take my business to the next level. My target demographic is students, so I need someone who knows how to reach out effectively to this group. The services I'm looking for include social media marketing, search engine optimization and email marketing. My end goal is to see results quickly; I need to start seeing a return on my investment within a month! I'm looking for someone who can deliver measurable results in order to get the best value for my money.