So This is the Teamfight Starter Role.
Each team has the one who strikes first and in result allies and enemies join the fight to help their friend.
Lucky is pretty good at doing it.
Goal: Start a teamfight.

How to do this:
Check the distance
How many times do you need to use Charge in order to hit enemies
Beware stuns and silences
If the distance is one time "Charge!":
Make sure the allies are near and you aren't gonna fight 1 vs 3.
Charge them once (beware: if you don't use again within 4 seconds "Charge!" will go on cooldown).

Good, you stunned them all, now use fury and charge back.
Go near and use fury again (CD of fury is reset upon hitting with "Charge!")
And then go back and let them chase you (watch the time before "Charge!" goes CD)
When the time is about 1 second, choose - start a teamfight? Or Not? If yes, charge them again, if not, charge back.

If the distance is two times "Charge!":
Make sure the allies are near and you aren't gonna fight 1 vs 3.
Charge them twice (only the second will hit)
Then use fury.
Hold them, you are pretty tanky so you won't die easily.
Wait until 1 second is left and charge back.
They will chase you, run away and give your allies time to come.

Okay so this is pretty good when a teamfight isn't going to erupt.
You reduce enemies HP and when a teamfight will erupt, your team will have an advantage.
Goal: Reduce enemy's HP
How to do this:
That's pretty easy:
Charge, Fury, Charge back, go to them, when you are inside your enemies group (or if you pass the enemy if it's only one) charge again back.
Go back.
If you do it quick enough you may take almost no damage.

I had to write about it. It's a nice skill.
Does: Heals every second for 4 seconds a certain amount of HP (16~)
Goal: Let your allies survive.
Who should live, and who shouldn't?
Preference 1: An ally who runs away
Preference 2: Low HP, melee, not support
Preference 3: Low HP, support
Preference 4: Doesn't have low HP but his HP isn't full.
Ranged are less likely to get hit, but if there's Marco, it's another story... When marco is your enemy, heal the one who has the lesser HP

About Kyra- she has a skill (Sacrifice) that she sacrifices some of her HP to heal an ally, keep her alive, she is needed and her Healing Pirouette can turn fight's tables

There's something that is called "Dive".
That means that you enter enemy's territory behind towers to kill an enemy.

You can do it.

Goal: Kill an escaping enemy.
How to do this:
Going by foot is dangerous, especially if you don't have "Charge!"

If he isn't going to die in the next 3 hits, you should dive only with "Charge!"
You should use once to attack him and twice to back up, so you won't be dead.
If you use once and he isn't dead,
choose:
kill him and die (use "Charge!" again)
OR
Back up (leave him and charge back)

Lucky is awesome for "Baiting".
Just walk into enemy lines and they will start attacking you and their spells will go on cooldown, and then you should charge back and your allies will come into the fight.
You will have the advantage!
If you have marco or brutus in your team - it's awesome, they can leap into the battle quickly.

Keep collecting elements.
Iron - will give you HP
small gives 3 Iron - ~10 HP
big gives you 10 Iron - ~30 HP

Moon will increase your Mend's healing
My build:

I hope you'll enjoy!