My opinion is that minimum hourly rate starts from $20 and up. You can try to outsource work for lower price, but you can expect that quality will in most cases match the price you paid. Elance, Freelancer are portals on which you can post your project and see an estimate of price for your project, based on the bids.
A good start to determine if person is capable to solve your issues, is to go over their portfolio. Check if websites are responsive, cross-browser and if they are made with bought html/css template or not.