i wouldn't know if there are any guides per se, as it's quite straightforward, just the general unix background that i guess you're confused about. have a look through the rute guide in my signature, it's really useful and contains a lot of information.
i presume you mean that your /dev/cdrom link doesn't actually go anywhere valid..? the 4 ide devices are
hda - primary master
hdb - primary slave
hdc - secondary master
hdd - secondary slave
a cd drive would normally be hdc, but obviosuly that depends on your system. there is normally a soft link (a *bit* like a windows shortcut, but actually completely different) from /dev/cdrom to /dev/hdc or hdb or which ever. it's only purpose is to make things look more obvious, not a critical thing at all. changing /dev/cdrom to /dev/hdb will not harm anything IF hdb is indeed the correct one.