[CentOS] Centos kernel problem

[Hanmo]

My system is Centos 5.3.  and I want to study the kernel,  for example,  write myself kernel module.  So I download the kernel source  *.2.6.18.tar.bz2  and compile it in my system.   make bzImage && make && make modules && make modules_install && make install. 
     When reboot,  I find I can not mount the ntfs disk to the system and some other software have the problems.   Before compile the kernel source,  I have installed the kernel-module-ntfs-* ,  and when compile the *.tar.bz2 kernel source,  I added sata support with modue style.     I want to know if anything I do not do ?   when modify the kernel,  how to update all the software?     If I install the  *.src.rpm  kernel,   is it difficult to start kernel with it?  Fox example,  if write myself module,  it needs to make rpm then can debug it?
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