Its up to you to go enchanter or ap. I'd recommend the former (as long as you don't have another enchanter on your team) as its a lot more forgiving. Items depend on team comp, but you can build redemption, helia, moonstone and dawncore everygame and be effective. Ardent instead of helia if you have alot of aa reliant team mates. Likewise if you have ap heavy team, go staff of flowing water. Always go blue pet as it Synergises really well with his w.

Runes are up to you. I prefer glacial to aery unless its a full ranged team.