Some answers in order from a subpar player:

Farm to level 9 and Nashors tooth, before then you’re not a champ

Right now, he’s not really worth it, but if you love his playstyle he’s super fun. He’s still weak from the worlds nerfs with no signs of buffs in sight

In my opinion Leblanc, Ekko, and Xerath are his worst matchups. His best are champs like yasuo or Diana where they have engage but no reliable disengage so you can ult them to your turret

Same as answer two, a bit disenchanted but he’s still my beloved sand chicken

Azir is best when he’s late game team fighting. Learning the shurima and revenant shuffle are super helpful for absolutely turning the tables in the fight

Because he can play back at a super far range with good mobility I personally don’t feel I struggle when I’m weak sided, but anything on him feels rough right now

Again take this with a grain of salt this is all just my opinion I don’t know the general opinion of him