I've never run Suse, but on Slackware these should all be okay to run with no problems.
1. No idea, I use MPlayer, which will play DVDs AFAIK (I dont' have a dvd-rom, but others here at LQ have said to have gotten DVDs to work fine, and have even supplied the commands to do it).
2. as root: alsaconf
then alsactl store
----will detect your sound card, set up sound modules, allow you to set your channels how you want them (type M to mute/unmute channels), and save your settings.
Hope this helps.