The pattern has forward and backward halves, and can be done to either the right or left.
There is a bit of a tradition in recent decades of starting a dance with the version where the man moves forward onto his left foot. Or, if starting with a figure that begins with a step forward onto the right foot, of preceding it with a step onto the left occuring at the end of the previous measure of music.
In class you might start directly into some later portion of the dance being presented, rather than always from the first step of the first figure.
In the grand scheme of things most attention will go into quality of movement - the steps are of only temporary concern (though obviously a lot of it when everything is new!)