I need a support Alistar build guide

Can someone give me an support Alistar build guide, from someone who's in like diamond or something. I've been playing him recently and been doing pretty good, but he's so mana reliant it's really hard to stay in lane for a long time. I'm not the best player (Bronze IV) , but i'm trying to main him for a while so I can get some good experience for when I play him in ranked. I want to know starting items, and items after that etc. Also if you could tell me runes to run with that would be sick, thanks.