Please find a nice article by Djoni Darmawikarta here. He gives a nice step-by-step tutorial on how to use MySQL Workbench to create a simple model and then use the Forward Engineering functionality to create the actual database schema.
If you have written such a tutorial yourself or plan to write one, please drop us a email at workbench@mysql.com and we will be happy to feature you on our official Workbench Blog!