Hi,
when you do the install, do a minimal server installation. Then follow the cpanel install guide
here to install cpanel.
The cpanel install will install everything that is needed to make it run.
For the old hard disk, put it in the server as slave, then use the command :-
fdisk -l /dev/hdb
Assuming you have slaved the drive on the primary IDE interface. This will display the partition table, and will typically look something like this :-
Disk /dev/hdb: 250.0 GB, 250059350016 bytes
255 heads, 63 sectors/track, 30401 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/hdb1 1 499 4008186 83 Linux
/dev/hdb2 500 865 2939895 82 Linux swap
/dev/hdb3 866 30401 237247920 5 Extended
/dev/hdb5 866 1352 3911796 83 Linux
/dev/hdb6 1353 3785 19543041 83 Linux
/dev/hdb7 3786 4272 3911796 83 Linux
/dev/hdb8 4273 6705 19543041 83 Linux
/dev/hdb9 6706 30401 190338088+ 83 Linux
To mount a partition, use :-
mount /dev/hdb2 /mnt
replacing the /dev/hdb2 with the partition you wish to mount. Note that you cannot mount the swap partition or the extended partition.
To check the filesystem, make sure it is unmounted and use the command :-
fsck /dev/hdb7
To format a partition, assuming you want to use the ext3 filesystem, use the command :-
mkfs -j /dev/hdb5
HTH