kernel compiling is not that easy.. if you make a mistake.. you might not be able to boot your system. try searching for "kernel compile how to". you will need updated tools/software...
cd to /usr/src/linux
then type: make menuconfig
do some changes with your sound card if it does support 5.1(oss) or try alsa.
type: make bzImage && make modules && make modules_install
then: cp arch/i386/boot/bzImage /boot/vmlinuz-new
then: cp System.map /boot/System.map
then add an entry to lilo.conf or grub...
label = linux-new
then run lilo..
if you get no errors then reboot.
good luck... again I advice you to read alot more,and if you think you already know it, read more again. before recompiling your kernel.