Newby--Basic Line Drawing

  I really only want to make some basic line drawings to scale.  Seems I "ought" to be able to use this program, but I gotta say, it's easier with a ruler and a piece of paper than figuring out how to even draw a simple line with this program.  It would be "nice" to have a manual--actually, the program seems pretty useless to me without one.  

Can anyone point to a simple primer on how to get started using this thing?

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