Ballroom dancing is different from most other forms of contemporary dancing: 
it frequently MOVES over the floor.  This requires traffic rules, similar to 
other moving 'vehicles.' By tradition, the general direction of flow is 
counter-clockwise.  The diagram below (Courtesty of Cheek2Cheek Dance Studio) 
gives a great explanation of movement rules for the dance floor. 
KEY POINT: if you are in the outside "fast lane"and everyone is passing you, please move to the middle ring!



Also, remember ballroom is an intimate dance.  For a pleasant experience, good hygiene is essential.
  Bathe before lessons and use deodorant.  Use breath fresheners frequently but
NO gum!  Hold off on aftershave and perfumes, as some folks are sensitive.