The command for displaying the whole RPM database is "rpm -qa", from there you can just grep for whatever you're looking for.
But I assume you have KDE installed since you installed everything?
In that case you can use "kpackage", which should be alot easier for a newbie.
"gnorpm" is Gnome's rpm manager, not sure if it comes with Gnome by default or not.
For what's running, you hace the various daemons, you can either look into /etc/rcX.d where X is the runlevel, ie "rc3.d" for runlvl 3.
An easier way is to run "setup" which is a tool where you can(among other things) configure services.