Hi Maurice,
Returning no spin serves can sometimes be difficult that’s for sure. Yes a flick can work against this type of serve very well, as you said making sure you don’t play this shot too quickly in the beginning and build up the confidence and speed gradually.
A long push or one with side spin as you said can also work well for returning these types of serves, bat angle is important here to avoid hitting the ball long. Make sure against no spin or float serves you don’t try to force the return or rush, take your time and stay relaxed in the arm and body allowing you to maintain control.
