Hi guys, this is my first Mobafire guide, i hope you will enjoy it.
First of all, i'm from Germany, so dont flame me for my bad english, i want to give my best ;)

So this is a Nunu & Willump Support Guide.
Nunu & Willump is a underestimated Supporter, but with Carries like Graves, Vayne, Miss Fortune or Kog'Maw
is Nunu & Willump an unstoppable force of pain.
So read the guide up to the end, and understand.

Pros:
- Great CC
- Good Sustain
- Great Speed ( Blood Boil)
- High Damage Ultimate

Cons:
- No Heal
- Easy to stop Ultimate
- Steals farm with Consume

For Runes i take:

Greater Mark of Magic Penetration - To burst with your Ice Blast and your Absolute Zero

Greater Seal of Armor - To sustain hits of the enemy AD Carry

Greater Glyph of Scaling Magic Resist - You want to die vs. the enemy caster? I know you don't want!

Greater Quintessence of Gold - Works perfect with your Greed . It is almost a "must have" for Supporters

For Masteries i take 0/9/21:

Resistance + Hardiness - You will be alive!

Durability + Veteran's Scars - Health is always good.

Summoner's Insight - To make your Clairvoyance even more powerful

Expanded Mind + Meditation - More mana for your Ice Blast

Swiftness - Better then the almost useless Scout

Greed - One of the best Support Masteries, combine it with your Greater Quintessence of Gold

Wealth - To buy more stuff

Awareness - Supporter don't farm much, so u need extra exp. to don't get under leveled

Strength of Spirit - lesser mana. more life... nice one :>

Intelligence - Spam your Ice Blast harder

Mastermind - Spam Clairvoyance and Exhaust

I use these items:

Start:
Faerie Charm - Manareg/later Philo
Sight Ward x3 - Vision, Map-control
Health Potion x2 - Pots OP
Mana Potion - For Bad Times

First back:
Sight Ward x1-5 - Vision
Boots - Faster Warding
Philosopher's Stone - GP/5

Next:
Sight Ward x5 - Vision, Map-control
Heart of Gold - GP/5
Ionian Boots of Lucidity - Spam your Ice Blast

Situational:
Shurelya's Battlesong - Great Item to engage and escape. Combine it with your Blood Boil. More Life, CDR, Mana and Life Regeneration
Randuin's Omen - If the enemys have strong ad/ if enemy's Carry is fed
Zeke's Herald - If your Carry owns
Frozen Heart - If their Carry owns
Will of the Ancients - If your AP Caster owns
Aegis of the Legion - Ask your Jungler, if he buys this, you don't have to.
Rod of Ages - Want Damage?
Rabadon's Deathcap - Want more Damage?

End-build should look like this:
Shurelya's Battlesong, Ionian Boots of Lucidity, Zeke's Herald, Aegis of the Legion, Frozen Heart, Oracle's Elixir, Sight Ward x5

don't forget!:
Elixir of Agility
Elixir of Brilliance
Elixir of Fortitude

Absolute Zero - Skill that with the highest priority, because: its your Ult.

Ice Blast - Max this first if you need a poke early

Blood Boil - Max this first if your carry get a few kills early (first blood)

Consume - Max this last EVERYTIME, you just need this for sustain. dont use it often.

Clairvoyance - One of the best Summoners for a Supporter, good for Map Awareness. Dont get this if you going to ward the whole map.
Clarity - You dont need this, you have 21 on Utility Mastery tree, and you have Visionary.
Cleanse - As a Supporter you dont really need this. Just jump in the sky if you get the Malzahar Ult, better you then your Carry.
Exhaust - Really good for chasing and win a Teamfight. Just use it on their Carry or Caster
Flash - Take this if the enemy Jungler has hard CCs (Alistar, Hecarim)
Fortify - WTF, are you playing Dominion?
Garrison - Are you still playing?
Ghost - You don't need it, you have Blood Boil
Heal - Say your AD Carry to take this. You should not take this. It's not that effective on you.
Ignite - Do you want to steal kills?
Promote - Fear the giant minion!
Revive - Feed faster.
Smite - go jungle!
Surge - The Great Nunu
Teleport - NO, pls NO.

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This guide will be updated!
Videos will follow!

Cya later <3