I would consider showing a section of work that you have already accomplished. Coming to your site, I would likely not use your services based on the fact that I am not able to see what you are able to do.
Thanks for the advice, that's actually what I'm trying to do now. I'm offering to build free mobile websites so that I can build up a portfolio for myself. Just out of curiosity how many examples of work would you be interested in seeing before you felt comfortable purchasing.