Kass is a hard champ to grasp. He is very good if you know what you are doing, but if you don't well GG.

Your early game is very important. You need to get your core items quickly so you can deal maximum damage.

Know that you can port around enemies and drive them ****ing nuts you should gank, even if you are mid.

Now kass is not normally targeted but if the other team hates you you need to be ready. I suggest getting Rylai's earlier for the health. Always target the AD carry as Kass you should easily blow him up will a quick r q w combo.

Being the melee sorcerer that he is Kass is easy to lane against with other melee's like Sion. He has no stun or slow but the silence duration on his Q is long so use that like you would use fiddle's fear.