आप just gained all the powers of the Avatar... What is the first thing you'll do?

I'd use my आग bending to make s'mores! And I'd keep them all to myself!
I'd use my airbending to fly (or Airbender whatever) over to the mall where I'd buy every piece of फ्रोज़न merch they have!
I'd smash all of the plastic things with my earth एल ended and everything that can't be smashed gets lot on fire!
Then I'd go to my फ्रेंड्स house and tell him I'm an alchemist now (we both like FMA). I'd दिखाना off my awesome bending skills and pass it for alchemy! Woo!
But I can't be too selfish. I would go to countries where it's hard to find clean water and a) make ponds closer to where the people live and b) use my water bending to clean the water!
This sounds like a good day, if ya ask me. I get to bend all the elements so I can destroy फ्रोज़न merch. (I don't like Frozen) and make snores then go to my फ्रेंड्स house and convince him I'm an alchemist and then I can actually do something hat the अवतार would do and help people! Yay!!!
Tbh though if get bored of these powers in about 2 months.

Learn how to use them lol. Starting with fire.

I will rule the world ! Muwhahahahah!!

The first thing? Accidentally set myself on fire, of course. :P

change the world

Make an ice गढ़, महल and then डिज़ाइन some weapons out of ice too. Water can make so much textures and it feeds my need of creation <3 Still, I guess I would find other uses for the rest of the elements. TOO MUCH POSSIBILITIES

Train. Train to attain true mastery over the elements and then do what the अवतार was always meant to do !!!!

i will marry Aang या zuko and then i would ride on my airbending ball thing and make s'mores with my firebending skills