Hello! I am the best Azir player in the world and I never ragequit or yell at the top of my lungs when I play this champion. You need not know my identity to get to the absolute top leve of Azir play. When you are ready to learn, scroll down!
If you are truly a top-level expert Azir, the game will be over before you can get any items except for the following (in this order)
Doran's Ring -> Boots of Speed -> Athene's Unholy Grail
Skills are an important part of playing Azir, but to keep true to the nature of the experts, I will let you decide what skill order you take because it really depends on the game. Sometimes you just take Q and nothing else, and I sometimes even just randomly click what skill to level up because there is no substitute for your personal skill in this game.
Flash/TP. Both are 100% necessary, so don't mess up in champion select and choose incorrectly
All other champions
You'll probably do fine, just sit back and harass with your Q...or was it your W? I'm confident you can figure it out.
I dedicate this guide to my least favorite champion Yasuo...burn in **** you filthy son of a gun ;)