First, the "incidentals"
In addition to your new website you will need to get two things; a domain name and an Internet Service Provider.  Costs vary, depending on the terms you choose and the size of your site, but we suggest you budget in the area of $300 a year to cover your ISP website hosting, dialup (by modem) email/browsing access and domain name registration.
If you prefer high-speed Internet connectivity for your email/browsing needs, such as Cable or DSL, the costs for these services average from about $40 to $50 per month.  Business website hosting is not normally included in these rate packages.

Next, the Web Design itself
Work can be costed on a strict hourly basis or on a project basis.  Many Web Designers require the execution of a detailed contract for service, whereas some do not.  There are pros and cons involved with each.
Selecting the right designer at the right price can be challenging - but here is something to bear in mind:  You'll typically be dealing with less-experienced designers with fewer tools and skills at the bottom end of the rate scale, and with larger design firms at the upper end, who must factor in some often-significant overhead expenses.

The best of both worlds . . .