Learning HTML will teach you just about all you need in Dreamweaver... all it's doing is creating HTML for the most part. It's better at it than most programs but I still find it easier to just handcode things since I know I'll do it right. I just use Dreamweaver so I can see what I'm doing and so I can insert basic things quickly. So if you learn HTML you'll actually be better off, because Dreamweaver will never be able to mess something up and confuse you with it. There are plenty of situations where my job was to clean up code in a page created by someone who only knew a WYSIWYG program.

So if you just want to get a page up and not worry about how it works I may not be the best one to listen to.