Tables can help you to organize the layout of your webpages. Within the Adobe Dreamweaver online manual there’s a section dedicated to tables that should help you get started.
Additionally, Adobe has two parts of a tutorial for Dw CS3 here and here. (Note that Dw CS4 is what we have on campus, but the steps are similar.)
Finally, remember that you can do a search for doing just about anything – just remember to include the software information. For example, you can search for “Dreamweaver CS4 tables” and get a lot of useful hits.