rule no. 1 for playing blitz : BUY MANA BUY MANA BUY MANA!
do ALLWAYS walk around with a tear of goddess. its the best item you can get on blitz.
actually, you only have to grab, knock the opponent up with your E, maybe use your ult for the silence to prevent flash.
hes pretty boring in earlygames, all you do is standing in the bush, waiting for someone to get in your Q range and pull him. should be allways a kill.
i think the most mistake people are doing is as maxing your Q first. basicly, it doesnt change anything. except a little bit of damage, but youre a supporter and your adc should get the kills. i allways max my W first, so i can save money for some g5/s10 items and walk around with normal boots.
point 2 : buy mana items.
dont forget your tear of goddess. never. the first item youre building should be manamune, if you play as tank. as AP blitzcrank, its archangel. my personal blitz build looks like this :
start with saphire crystal and 1 ward.
then buy tear of goddess ,philosopher stone, heart of gold and kages lucky pick.
the core is
boots of swiftness/ionic boots
manamune
roa
frozen heart
rylais
banshees veil.
when youre playing AP blitzcrank, it should be
ionic boots
archangel
roa
zonyas
rabbadons
abyssal.
when you have your tear of goddess, allways, really ALLWAYS activate your W and E when you can. even if you stand in your base, use them. youre tear will be fullstacked after ~30minutes.
it usually ends with stats like 15/0/25 when im playing blitzcrank (tank support).