start dorans with 1 mana pot and 1 health pot. you should be able to stay in lane till you have enough for a giants belt,boots,wards,hp/mana pots . After that buy rylies first then RoA then Sorcerer boots then depending on their team buy ice born gauntlet or spirit visage. Then if you are doing good so far by a rabadons if not buy a a defensive item /armour or MR if you need more to live you should be good just get all of the blues and spam your E. and wait in bushes and use the oracles lens and clear the wards in it if there are wards then wait for your victim then start charging your ulti when they get close enough and bam they die. your welcome :)