START:

Blue Side: When starting blue side you want to protect the entrances to your jungle, so sit in tribush near bot, or go to the bush behind dragon pit. Then you can ask if your jungler needs a leash, if not, try tp predict if the enemy botlane will go to lane through the river of through their lane, and sit with your support in river or lane bush respectively to ambush the enemy.

Red Side: When starting red, first thing you want to do is ask if you jungler needs a leash, if not, go straight to tribush and wait to ambush the enemy botlane after they finish their leash.

If the jungler does ask for a leash then sit in the river bush near mid lane and protect against any invades with your Q.

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EARLY GAME:

If you didn't get a chance to ambush the enemy then return to lane as normal and get the first three melee minions wih Q charge. Now you will want to check you supports playstyle to see if they are agressive or passive, and play accordingly to make plays with Q charge.

Bush control on Sion is everything, if you can get a fully charged Q on a ADC then its almost always a free kill, thats why I like to always bring the sweeper trinket. Whenever you can, try to buy a pink ward to control the bushes even more.

Farm as well as you can, without passive stacks you are very weak (also the gold is really nice)