How do you play this crazy old man?

Hi, I just got heimerdinger bee skin and decided to try him, went up against galio top and lost as time went on, I was able to deal dmg but I just couldn't kill him nor could I get a lead so I wanna ask

How do you build him? Runes and items wise

Is there any way to kill someone if they don't try to all in you/stay under turret