Its is very difficult to say how much a website will cost because there are so many factors to consider. Asking how much a website is to build is like asking how much a brand new car is .........it all depends on the car, the model, the specification and what the car can do.
There are lots of things to determine such as whether you need a bespoke website solutions, whether you want to sell products online (ecommerce website) or maybe you want some simple fancy features such as galleries, contact forms.
I would suggest speaking to a few web developers / designers and asking their advice. They will probably ask what your requirements are and if you are unsure what you want, then they will be able to advise you on the best options to suit your project budget.