I'm not quite clear on what you are asking.
Have you made the entire page layout as a single graphic in Photoshop? If so, that isn't the way to go about it. You can slice it up in Photoshop and export it to an html file and then put content in the places you want. Or, better yet, make the graphics in Photoshop and drop them into a table (or more properly divs) to hold them in place.
In DW you can insert a table in the...insert menu. Then add the graphics from there.
Inserting tables with Dreamweaver is really easy. All you got to do is to use the insert tool, specify the number of rows and columns and you will have a table ready. Select 0 if you don't want the borders. Just experiment with the tools a little bit, you will find it very easy to learn quickly.
The best part about tables is that you can insert tables and merge cells in tables so you have text and graphics alongside each other. Tables are great for creating a very nice layout which will be very difficult otherwise.
Good luck with your learning