Installing Ubuntu 13.04 on a MSATA SSD

Installing Ubuntu 13.04 on a MSATA SSD

I am trying to install Ubuntu 13.04 on my 24Gb MSATA SSD. In my laptop,
I've also got a 500Gb SATA HDD. I realize that in order for this to work I
need to put my /home directory on the 500Gb HDD.
I've tried installing it by creating a ext4 partition on the SSD and a 8Gb
swap partition on my HDD. This resulted in an error saying something
similar to Cannot install bootloader, please select an other location for
the bootloader.
Now before I waste any more time trying to get it to work I'm going to ask
a bunch of questions:
Where should I put the swap partition?
How big should I make the swap partition? (I've got 12Gb RAM)
My 500Gb HDD is currently in Raid mode. Should I change that (to AHCI or
IDE)?
Where should I put the bootloader if the error message occurs again?
How do I make the home directory point to the HDD instead of the SSD?
Can I configure Ubuntu to install software/packages on the HDD instead of
the SSD?