Welcome to SitePoint.
Unfortunately, your question is too generic to merit its own thread. This area of SitePoint (Social Media) is full of discussions on how to build a business using Social Media. Take the time to do a search and read up on it.
Being new here, you might want to start by reading the announcement at the top of this forum and the !IMPORTANT*community guidelines at the top of each forum so you know what is appropriate here and what is not. Then if you have a specific question, either ask it in the relevant discussion or post it in a new thread if there is no open thread already discussing your question.*