There is a wealth of info and a videocast here. http://drupal.org/videocasts
Also note, you have to uprade 4.6 to 4.7 before going to 5.
...and remember to disable all the contirib modules before upgrading (you will need the 5.x versions)
one moore thing -- make sure 5.x has the contrib/features you need before upgrading (I couldn't upgrade some sites until certain modules are ready)
Also, the default theme 'Garland' comes with Steve's color picker, but not a layout manager. I'm getting used to the themeing layer myself.
ping me if you need more help, your best resource is drupal.org