Gosh this is so foreign to me. Can't wait until I know what I'm doing with this drive stuff. Does the cable usually come with the external drive?
Join the club. I was in the same boat as you and went through the same gnashing of teeth and all the rest of it back in November.
Check out (ie, run through) the thread
External hard drives for backup that was generated at that time. Many of your questions and concerns might be answered and allayed.