i have searched google and these forums on how to configure repositories and updates and i cant find anything.ive been using opensuse 12.1 kde for 2 days now and i cant figure it out.need a walkthrough on the repos and updates.
heres what im trying to do:

1)stay up to date with latest security packages
2)run only kde desktop and install whatever missing packages kde has.
3)have normal opensuse updates
4)and whatever else important software i need such as bug fixes and stuff.

thanks in advance cause i just messed up my system with installing all kinds of things that werent needed.dont know what i am doing so please bear with me