How much should I charge?

I have a client that would like me to develop a site that is similar to this website. http://www.kingsdale.yourmd.com/ The client will be three doctors. I am fairly new to having client, but have experience in developing website. I know html, mysql, php, flash. How much should I charge them? Should it be hourly or one bulk price? Your advice would be great. Thanks

Cheers

Norm125