on the persons first day, they arent actually on the rota, they come in for induction.
showing round, policies, curriculum, planning, introductions, fire procedure, etc etc etc. right down to contracts,uniform wages, time off, contact numbers etc.

then they stay and observe the routine, chat, play whatever and watch packing away, to see what happens.

all this under supervision of leader (me!!)
then they are ready for their first day.