Partitioning My Harddrive, need some size suggestions Options

[iJons]

I just bought a titanium powerbook with 60 gig hard drive. I want to partition it so that I can run both osx (for general use) and os9.1 (for pro tools le, and other audio apps.)

More specifically, I will need space for approximately this
OS9(Audio)
- Pro Tools LE
- Reason 2.5
- NI Absynth
- NI Pro 52
- 1 or 2 other apps
- A significant amount for audio storage (is 15-20 gigs alot?)

OSX(General)
- a few gigs for applications (games, development tools, etc.)

also
- about 20+ gigs for raw storage (mp3, movies, installers, etc)

I don't know how to partition it though. I was thinking 3 seperate volumes, one for each os and one for raw storage. Don't know if there is a better way though. I have never done this before, so all suggestions are appreciated. Also, is there a way to partition without losing the data I already have accumulated on my drive? or do I need to backup everything. Thanks JOn