Why are you following Ubuntu howtos if you have Debian installed?
Why don't you use some paragraph breaks?
Debian is not often considered a good first distro for Linux newbies. If you know what you're doing, it works easily. Etch doesn't have Java 6, so stick with java 5 for the time being ... You definitely don't appear to be ready to move up to Lenny (Testing).
Make sure your sources.list contains "contrib" and "non-free"
and also ...
deb
http://www.debian-multimedia.org etch main
# aptitude keep-all
# aptitude install debian-multimedia-keyring
# aptitude install flash-nonfree
# aptitude install sun-java5-jre
# aptitude install sun-java5-plugin
... and you're done.
If you can't manage that, you might be better of to start off with Ubuntu, or another more newbie friendly distro.