Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
With Annies burst dmg and stun on command you just farm last hits on minions with Q and when you hit level 6... its game over.
If you have time you can prepare your stun in spawn with W and E. just hit them and get your stun.
Skill order for killing people (Press E before combat)
Fire ball - STUNNED
Ultimate + Alt Right click to make sure Tibers is attacking your target
Target is dead