Teemo Abilities
Camouflage
If Teemo stands still and takes no actions for 3 seconds, he becomes stealthed indefinitely. After leaving stealth, Teemo gains the Element of Surprise, increasing his attack speed by 40% for 3 seconds.

Blinding Dart
Deals 80 / 125 / 170 / 215 / 260 (+80% of ability power) magic damage and causes the target to miss all of their attacks for 1.5 / 2 / 2.5 / 3 / 3.5 seconds.
this ability is wht save teemo's life the most and puts alot of damage to everyone in earlygame. In late game, this will prevent squishie teemo from getting hit hit by melee attk champs makin them miss their attks, like master yi, ashe...

Cooldown 12 seconds | Cost 70 / 80 / 90 / 100 / 110 mana | Range 680
Move Quick
Toggle: Teemo's movement speed is increased by 15 / 20 / 25 / 30 / 35% until he is struck by an enemy champion or turret.
This is a decent ability, moving faster, sometimes its useful to get away, caz u cant get slowed for like 2-3 seconds due to the january patch.
Cost 40 mana | Range 20
Toxic Shot
Teemo's basic attacks poison their target, dealing 8 / 14 / 21 / 28 / 35 (+14% of ability power) magical damage upon impact and again each second for 4 seconds.
This is what you want to max 2nd. This is a really nice passive ability, sometimes enemy gets off with half a bar of hp, and if ur lucky toxic could kill that champ for u !

Range 1
Noxious Trap
Places a trap which detonates if an enemy steps on it, poisoning nearby enemies. Poisoned enemies take 350 / 500 / 650 (+80% of ability power) magic damage and have their movement speed slowed by 30 / 40 / 50% for 4 seconds. Traps last 10 minutes.

Cooldown 20 seconds | Cost 75 / 100 / 125 mana | Range 230
Shroomies, u gotta love them,they can ward, they can slow, they are the silent killer. In mid-late game i would fill the whole jungle with shroomies. You do basiclly nothing, and the shroomies jus kill the champ for u ! =D

items, i usually rush everything. the last 2 items Black clever and GA, u can choose which one is more suitable for the game