You can use Fieldboom.com to survey your audience, which will, in turn, help you create your personas.

By analyzing various aspects of your customer base – as well as how these aspects relate to one another – you can start to get a more complete idea of who your customers are, and what they’re looking to get from engaging with your company.

You can find more info on how to segment your customer base in this blog: http://www.fieldboom.com/blog/customer-segmentation/.