You wouldn't actually use Dreamweaver to create a database, but you would use Dreamweaver to create an HTML front end to access a database.
Since it looks like you're using PHP and MySQL, you would use what ever MySQL tools your web host provides for administering MySQL in order to create the database. Then, fire up Dreamwever to build your HTML pages to enter data into your database, or extract data from the MySQL database to display on your web pages using PHP scripting. If this sounds complicated and a bit intimidating, don't wory, it is at first. Luckily, there are scores of websites and books to help shed light on this. I found PHP and MySQL Web Development by Luke Welling and Laura Thomson a great help when I first started, I consider it an excellent beginner's book for PHP and MySQL. Also, check out [hotscripts.com...]
Here, you will find installation kits for Windows, OSX or Linux so you can install PHP, MySQL, Apache, etc... on your own computer. Having these at your disposal will really you help learn how to build a database-driven website.
Hope this helps!