Simple guestion:
How I update my Amarok to Amarok 2?

You can't. Amarok 2 is has been completely rewritten and based on KDElibs 4 and Qt 4. You'll need these to start if you haven't installed them already. None of the 1.x scripts will run nor themes. On my system 2 even confilcts with 1, so if you are ready for Amarok 2 you'll need to remove the old version first.