as for the bios, i think it should say what button on the bottom of the screen, but it may say something like press <f2> to enter settings...something to that affect
And as for partitions, there are a couple of ways to find use that i know of. I think the main one is organization. Also its helpful, if you want to run seperate OS's on one hard drive, but i'd have to research to get some real info. Also if your using ntfs, i think they call them volumes instead of partitions.