Corner lines are effectively permanent, any point that's always tied off deserves a permanent line.  Everything else is usually added as needed for the conditions.  Sometimes a centerpoint line, sometimes a ridge line, sometimes a center pole.  Once the main set is up there's time for tweaking.

I don't like tangles.  With my tarps being my only shelter I like to be able to quickly set them up in a downpour. 

For my guy-lines I use something similar to a very small butterfly coil starting from one end of the rope.  Left hand is the jig held in a Hang 10 sign.    (You need to Login or Register   (You need to Login or Register  Cord goes around thumb & pinky crossing itself in between.  Then that mass of figure-8s is folded and wrapped with the last 12" of cord.  When it's time to pitch the tarp just grab a fist of cord and walk away paying out line as needed.

A big fan of the 3m reflective cord.  They used to make it red, now it's black & less visible in the day than it is at night with a light on it.  It should be hot pink, hunting vest orange, fireman yellow.

Most all my lines are butterfly-coiled.  That's just how I learned.  It keeps twists out of the rope.