The coach is just inside the baseline, deuce side. Players line up behind the service line, deuce side, opposite from the coach (see graphic below).
First player in line will step up towards the net and prepare to execute 10 volleys (fed by the coach).
For the tactical purpose, the player will have to decide which balls he’ll return/volley cross-court and which ones he should hit aggressively down-the-line inside the opposing ad service box (place some targets there).
Note:
Players should be instructed to hit the low and medium high balls cross-court while the high ones should be attacked and hit down-the-line (at the feet of the imaginary opposing net player). 
– To avoid having the players wait in line for too long, the one who just hit his 10 shots will pick them up before coming back to wait for his turn.