well... once again I am going to recommend the best tutorial I have found for this subject. It explains EVERYTHING you want to know about Fireworks--> Dreamweaver.
Taking a Fireworks comp to a CSS-based layout GordonMac
On a side note... exporting layers in that version can be a bit tricky, unless your layers are named & sorted PERFECTLY. Check out the tutorial... long 3 part series. I recommend that you do the full exercise.. you won't have another question