It's a bit unclear where exactly you are at this point...
is basically a mechanism which logs changes made to a logical drive so in case of a crash (sudden loss of power or another severe system failure such as a kernel panic - both extremely unlikely) the system won't have to scan thousands or millions of files for structural integrity when it reboots again. Instead, the saved journaling information provides a much quicker reference to which changes had been under way when the crash happened. It's basically a mechanism to save time in case of a crash.
In recent versions of MacOS X, partitions in its own HFS+ format can and should have journaling enabled. The partition format is indicated as "Mac OS Extended (Journaled)"
in that case when you invoke "get info" for a disk.
I haven't used Boot Camp myself so far, but my guess would be that the dynamic resizing of the MacOS partition to accomodate a new Windows partition might not work properly when journaling is not enabled. Is that where you're stuck?
These articles are probably pertinent to your problem:
Boot Camp Assistant Beta: "Your startup disk cannot be partitioned..." alert
Disk Utility 10.5 Help: Using journaling to recover your information