Once you go to "manually edit partition tables" you should see your windows partition. It should say like "#1 Primary (size) ntfs". Under that there should be something that says, "Free Space". If you don't have any free space, then use a program like PartitionMagic in windows to resize your ntfs partition to make room for ubuntu.
Now once you have space, make a new partition with the free space. Make one partition (as big as you want) and choose ReiserFS for the filesystem, ReiserFS is much faster than ext3 B) . Now make another partition for your swap. Make it about 512 or 768 megabytes and for filesystem choose swap. Some people like to make a partition for the grub, the bootloader, but you don't have to, afaik. Now continue and look at your partition table. Under your ntfs partition you should see something like "#2 Primary (space) ReiserFS /" and "#3 Primary (space) swap swap". Now finish partitioning and continue.