There are several fine tutorials online that will generate the html and css code for you. Try
http://purecssmenu.com/ or
http://webdesignerwall.com/tutorials/css3-dropdown-menu, two that I picked at random.
I could offer personal help, but I'm a big fan of using a platform and letting the platform do all the work. I like wordpress or drupal. No one should be writing html by hand, regardless of what an FRC awards judge might tell you (or me). Of course, you won't win that argument; you never win arguments with judges. But that doesn't make them right.
George
Head Coach, Team 53
and former director of web operations, AOL
34 years on the Internet, and counting