actually juat making a / and a swap partition on some free space would be enough, if oyu then make a fat32 partition aswell you can easily share files between the two.

if you could a extra new disk that you could make the 3 partitions on would be nice, not necesary but...

or even make 4 primary partitions on that new disk (yes 4 primary partitions works)
/ 3-4Gb
swap (rule of thumb says 2x memory, id say less if you have more than 512Mb)
fat32 (30Gb or so seems fair) for sharing files...
and rest for /home (10Mb min)