a capture card is just a vga > usb converter.. basically has the red/white/yellow plugs on one side and usb on the other side, so you can record from video..
aside from that, you will need a program to record, and a program to edit.. if you buy a dazzle (highly reccomended) then it comes with a recording and editing program (not a good one though, i suggest you get vegas or after effects)
good luck..