Web Design Question?

I need some information in terms of price range , am thinkin of startin up a web based company i.e creating websites but i need to know how much money i should charge for creating sites, this is not set in stone so to speak i just need an idea of the price range for a site. I think am being a bit over the top when i say starting a company however if anyone could give me some insight into this topic i would be greatful