RAID 1 Config with AMD 780G Chipset

[Paul McCumber]

Just getting started so obviously I have questions about step one.   The
instructions I have say:

* Use the dialog boxes to create one primary partition large enough to
hold the root filesystem
* For “How to use this partition” select “physical volume for RAID“, not
the default “Ext3 journaling file system”
* Make the partition bootable.
* Use the dialogs to create one other primary partition taking up the
remaining disk space. Later this will be used for swap.
* For “How to use this partition” select “physical volume for RAID“, not
the default “Ext3 journaling file system” and not “swap area”

My QUESTION is, I have two 1 TB drives, and I'm building two partitions
in the above steps.   It says, build it "big enough" to hold the root
file system and the use the rest for swap.   Really?   

How big would y'all make the first bootable part and then the second
one, the swap?

Thanks in advance, Paul