The first thing you need to do is to figure out exactly where your target audience is online. Which social media sites are they on and how often are they on them? This is all research that must be done beforehand.

Then, you (or a marketing professional) must create a social media strategy. This strategy is like a plan that will layout the future pathways toward achieving your goals through social media marketing.

Here are some blog posts I have recently written regarding how to get new customers on social media:
-http://www.bloominari.com/blog/how-to-capture-leads-using-facebook-in-3-easy-steps
-http://www.bloominari.com/blog/why-use-linkedin-market-business

If you'd like help with social media marketing or even just some consulting, please let me know because I'd love to help you!