Welcome to Linux Questions. One of the SuSE manuals on the first install disc ( Look in /doc/en/ ) will introduce you to many of the programs you might have installed. There are a number of good howto's on the
www.tldp.org website (The Linux Documentation Project). Also, look in /usr/share/doc/. Some packages like mysql and mplayer will have documentation there. For samba, there is a samba-doc package that installs html docs and pdf books. The same samba 3 books you can buy in the book store.