You can open up an LLC with just one person running it. It doesn't matter how many people are in the business to open it up. It is just a way to protect assets and set it up as a business unit.
the little bit I have looked into an LLC it would probably be a good fit, but there are other possible options such as an s-corp
here is a good basic difference between the two
http://www.webanswers.com/business/what-is-the-difference-between-a-ll c-and-s-corp-904c67





