I made this build to simply walk into battle and make everything better, by fallowing my build you will give nearby allies extra Health Regen, Mana Regen, Armor, Magic resist,and cooldown reduction. And you will be able to give them a shield or burst of speed without spending mana.

BUY WARDS! whenever you go back to shop get a ward or to, its your job as a support to keep your team safe from unexpected ganks. you can buy the items on the list in any order you want, but I advise fallowing the first 7 steps. if you find you need more mana, build your Archangel staff sooner. If you feel the need you can build a Rylais Crystal Scepter for the slows.

Have fun with it, I like to play around with my Runes/Masteries and this is what works best for me, but you can do things different If you want.

This is an interesting topic, I get my heal first to keep my carry in lane as long as possible, and erase harassment. But other then that it all depends on the game; do what you eel is best, but max you heal as soon as you can.

Take Heal and Clarity to keep you and you teammates alive and in battle. You can use your heal to heal multiple allies at once, and stay in-lane twice as long. Clarity means you never have to leave lane again, (you may not want to take blue seeing as your mage or jungle need it, so Clarity and Tear of the Goddess give you all the mana you need.)