Terry, anybody...
Do I have to have a mac mail account to sync folders' or even use idisk?
How do i share folders/ set permissions for this to use a shared network?
Fairly certain that "iDisk" and sync is part of the .Mac thing. So, yeah, you'd need a .Mac subscription.
I haven't used .Mac, so I'm not sure how it is setup.
A "shared network"? Not quite sure what that means, exactly.
On a network you can share folders (and set permissions on those folders) between Macs easily (without .Mac). You can probably do a Google search for help on that.
-Terry