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On the OP, voice communication is key and can help you, over communication can be annoying and lessens the impact of the important ones (just like using the whistle). A typical example of over communication for novice referees is yelling out "red ball"/"green ball" every time the ball goes out for a throw in, even when its clear who's ball it is. Same with goal kicks and corner kicks. However if you feel players may expect something that you wont be giving then I would communicate that (this sounds more like your case). However I would keep it short, "NO", or "keep going". If you are asked questions then you can explain at the next stoppage but keep that short too.
On the other point, I use a technique similar to when I play advantage for a yellow card offence to help me remember who it was. Just before you turn around to follow play, point to the player (make it obvious) and look at his face for a second. Once the ball is out of play, even if you still have trouble identifying him, everyone else including the player know who it is. Look at the general direction and gesture for him to come towards you with a smile. You'd be surprised seeing how often that works and the player walks to you.
On the other point, I use a technique similar to when I play advantage for a yellow card offence to help me remember who it was. Just before you turn around to follow play, point to the player (make it obvious) and look at his face for a second. Once the ball is out of play, even if you still have trouble identifying him, everyone else including the player know who it is. Look at the general direction and gesture for him to come towards you with a smile. You'd be surprised seeing how often that works and the player walks to you.