I guess you didn't open the user guide.
Everything isn't installed by default in suse. Kernel-source, gcc, and ... are missing. But they are on the CD/DVD.
YOU DONT NEED TO COMPILE, because you have rpm packages available allready on the media.
Rpms are like .exe in windows. You install them with yast on straight from command line with rpm or yast(rpm -i gcc.rpm or yast -i gc.rpm)
You can use different kernel if you want, then you have update it manually everytime.
Open Yast -> software management -> search
type "kernel" and select the sources
type "Kdevelop" and select it and dependencies (gcc,make,...) will be installed automatically