Best way to build a website with hundreds of pages

Question

What is the best way to build a website with hundreds of pages that include businesses in every city of the U.S. I will be building it in Dreamweaver CS4 and pulling the data from an MS Excel spreadsheet.
I started building it by building the first page and then saving a new page with new data and so on.
There must be a way to pull from the Excel doc without copying and pasting each page of data, and there must be a way to build this site smaller and easier to make changes when needed.
Thanks

Answer 1

You already have other people addressing the DB issues - so I will bring up the other... You are just saving a copy as a new page and then copy and pasting the changed content into  it?
What you want to do is take the first page, once you have your design done - and save it as a template (file - save as - Dreamweaver Template).
Then you want to select the areas (most likely the divs you have content in) that will have content changed, and select the div or p or whatever element... and go to Insert - Template Objects - Editible Region.
Make sure you don't made editable the areas that are the primary design - such as a logo element, a header image, the navigation etc.  If you want to change those - you would do so by making the change on the template, and then it will automatically update all pages made based on that template.
Once you are done setting up the templates - go to your new page and choose Modify - Templates - Apply Template To Page
Select the template you just created (note it will be placed inside of a new folder titled "templates" automatically by Dreamweaver).
Now, any of the areas you selected to add different content into will be selectable, and you can copy/paste or however you are doing so.
Good luck