Home Forums Networks & Cross-Platform Other OSes on the Mac Mac OS 9 — Upgrade and file transfer

I am currently running Mac OS 9.0.4 on an iMac DVSE.

If I want to install an upgrade (say 9.2, which I have on CD disc), how do I do it without losing everything that's installed in my current OS 9.0.4? I am reluctant (read: scared) to attempt such a task because of the latter concern.

And if I get a new iMac, how do I transfer browser bookmarks and other such stuff from one system to another? Cabling? Compatibility? I haven't a clue. I'm currently using Mozilla 1.0.1.