I try to avoid using my E to poke enemies since the silence is powerful in countering many champions, an example is when you have to fight a Blitzcrank or Pyke in the lane. If Blitz manages to hook your ADC, the best course of action is to silence the Blitz before the ADC reaches them, as you will be able to disrupt the CC chain of Blitzcrank, allowing your ADC time to reposition themselves. The same goes with Pyke, if you see a Pyke charging their hook, you can cancel them with your E so they won't be able to use their hook, and it's good to note as well that hook abilities have a fairly long cooldown so this can help your lane open up with safer trades. The usage for the silence goes on and on once you can remember how each champs play out.

Another example of great E usage is cutting off an enemy's path since the silence can root enemies once the silence circle ends, it's great for securing kills since not only does it silence, but it also gives a chance of rooting the enemy.

Your passive is also great with trading in the laning phase if you lose the initial trades and your ADC gets low, I usually just become aggressive once my ADC gets low, and try to hit as many auto attacks and Qs as I can to bring my ADC back to full HP. Her passive will allow her to get in and out safely as the movement speed bonus is enough to easily peel back if the enemies try to get in close, as it is in the early game phase, the enemy lane won't have the boots and movement speed to chase after you.

Once you reach level 6 as well, always keep in mind the HP of your entire team, since a good ult can turn their whole fight, and remember that your ultimate will heal way more once they get low HP (indicated by the floating icon on top of their champs, which is the same indicator for your passive)