For the begging i want to say that kennen is good if he farm minions a lot.At begging of game u must buy armor for him because he would be so bad.First q skill....thats skill shot nice skill but problem is that u can shot the minions and u will ran out your energy.U must for the begging just furm minions.than buy will of accient and wait for lvl 6 than u have combo and double stun.Than u can do first blood on your lane.After that u need to buy more ap and u can buy rylist cristal scepter for more hp and with that u can slow....Two stuns and slow can help u so much..when u are feeded buy rabadons deathcap and u need magic pen so u need to buy some item like void staff.Good luck and play kennen with so a lot of fun.im happy if i can help some people thats why i write this guide :)))