For about 18 months now, I have been a maths teacher in high school, with ~100 pupils (11-13 yo).
For several reasons, covid vaccination is going very slowly here in France. Out of curiosity, I recently asked my pupils who would get vaccinated today if they could. Not even half said they would. When asked why, they said "it wasn't safe", that we should wait until we know more about possible side effects, etc.
What data/fact could I show to convince them to get a vaccine shot ASAP?
You could present the numbers from the safety studies. You can also compare that for the mortality and hospitalization rates. I'm not sure if that would help or hurt your case, but I think it would be the best way to help them make up their own minds.
What are the chances of them having a negative outcome from covid compared to having a negative outcome from the vaccine.
Then they can make an informed choice for themselves.
1. Age 80+ and healthcare or other frontline workers - starting now
2. Age 70+
3. Age 60+ and those with underlying conditions
etc
It's quite a long list and you're looking at millions of vaccinations and boosters before any children will be considered unless they have major health problems. We've done roughly 2 million injections in the UK so far.
Also for minors I suspect the decision to vaccinate will be mainly with the parents not the kids, although it would be nice if they were compliant.
As mentioned below a statistics lesson on the groups of population by age/risk and statistics on catching the virus and outcome would be interesting.
You should educate them on the history of diseases and vaccinations and why this one is safe (no live virus). There are lots of resources. Just give them facts. You can’t stop all anti-vaccers
Avoiding both the vaccine and Covid-19 exposure may not be viable long term. Everyone's getting exposed at some point. Corona's have never been eradicated in human history, so I wouldn't count on the new corona going away. Eventually that virus is finding a way to hop into your body. Best to prepare your immune system.
I would give them the information and background in how people have abused vaccine trust(Andrew Wakefield), and trust them.