Servers should be familiar with the main parts of the mass and their responsibilities during each part.
The Order of Mass is laid out in the missal (DWM pgs 559-658)
The typical Order of Mass at the Cathedral of Our Lady of Walsingham is as follows:
Prayers before Mass (in the Sacristy)
Prayer Over the People (in Lent)
Last Gospel (From Christmas to Candlemas)