I would first head over to http://www.mysql.com and read through the documentation for standard use of mysql. There's a reasonable tutorial in there. Then I would worry about figuring out phpMyAdmin. phpMyAdmin works best as a supplement.
BTW... another good thing about this site is they've got about two dozen pictures of really attractive people on their home page... true they're probably just a bunch of normal folks like you and I... but doesn't it make you want to host where the really there beatiful people host?
LOL... I like it.