As a general rule for dps... all dps jobs has a starting move that gives players a buff to subsequent moves. Blm is fire(fires are your dps move, while ice is to recover mp), monk is the side moves or back moves, lancers is flank move, archer is the pink arrow move etc. You know it's right cause an icon pop on your player status bar. If you don't pop an icon your not reading your skill correctly. So rotation is basically using moves without letting that icon drop. don't worry most of the icon moves last 20-30secs ... so you should be able to do 2-3 combs of moves before you return to icon move.