I have a site that I built in Dreamweaver CS5 and I would like to take the CSS and HTML and put it into WordPress and make a custom (I think) site.
Ok. Have you researched into creating Wordpress themes to understand how to integrate your code into the Wordpress CMS? It's mostly a matter of figuring out what variables you want to print and also how many page templates you need. If you run into specific issues users may be able to help you here, but right now we don't have much to go on with where you are at.
This is the Wordpress documentation. This will give you an in-depth look at everything that can be edited and is good for reference once you go through other tutorials:
Then the following is a good tutorial to start with.
In addition to the links SnakEyez gave you, this might be of interest:
Making Dreamweaver Templates into WordPress Themes