Have a look at this thread, adapt my contract to suit your hourly requirements.
http://www.talkfreelance.com/thread2745.html
I would like to make a suggestion here though, hourly rates are a lot more risky than quoting. With quoting for jobs you can ask for a deposit to cover your time and risk during the initial period, hourly rates pricing you can't unless you provide an estimate and base the deposit on that. Also with hourly rates you have to endeavour hard to keep the project, and client, costs down.
When I was charging hourly I kept my pricing a lot lower than quoting for projects. This way I was able to build a portfolio, but not at the expense of the client through developing my own personal techniques. Now I charge clients full price ($100/hour) and I know how much to charge for almost every type of project.