Just use a dual head video card but you'll need a fairly powerful chipset for that. (that's partly why I am using a P4, for front and rear monitors). You can have different applications running on each screen but not different logons (there might be a way, but I don't know of one).
If you just want to display the same image on more than one screen, you can split the vga, but you will get signal degredation and poorer quality video out.
If you're not a computer "guru", you should stick to a fairly simple install first. This doesn't sound like one.
Also, try posting in the newbie section until you gain a little more experience. People here aren't very tolerant of newb's (I think they have forgotten how much there is to know and learn when just starting out!).