ReiserFS is a type of filesystem, kind of like FAT32 or NTFS is to windows. it's a good choice to use, especially if you expect to write a lot of smaller files (ie., not mostly a multimedia disk, in which case use ext3).
strictly speaking you don't really need a /boot partition. you might be better off with 1 swap, 1 reiser or ext3 for /, and one reiser or ext3 for /home, which is where all your user files will go. these days, i don't really think it matters in which order you make the partitions. afaik, your system disk (/) will have to be primary, but you can do all that in the setup. 4GB total is cutting it a little close depending on what you want to install, but as long as you're not putting on there like *every* desktop and every gui tool there is, you should be okay. have fun!