Start :As Camille Support, you are a tanky melee support, so you want to start with a relic shield.

Don't forget!: Don't forget to buy pink wards!(I recommend trying to always have at least 2 with you)

Try to get those ASAP!: Buy your red trinket when you get sightstone. Your ideal first back would be 1375 gold, Sighstone + Targon + control ward.

Core: I personally prefer Eye Of the Equinox over the Face of the Mountain + Ruby Sightstone combo, but if you want to go with those, do as you will. Try to get knight's vow and Locket of the Iron Solari quickly, those are your first items and will allow you to get tanky stats and peel more.

Core 2:I've been having a lot of success with righteous glory recently.

Boots: As for boots, you'll need Swiftness (good for both roaming and fighting), or Lucidity (Nice early CDR) or Mobility if you want to roam a lot.

Some Nice stuff: I love stoneplate for the tanky stats, and most importantly the Iron Solari + Stoneplate combo.
If the ennemy team has a lot of AD, go for thornmail. If they have a lot of AP, go for spirit visage. Those last two items really depends on what you need and what you feel would be good.

Situational: Take redemption if you REALLY want to go support (even if it doesnt heal that much with the recent nerf).
You can also take a Black Cleeaver to help your team shred through armor. If you like zeke's convergence, it can be taken in consideration.

Don't want to support?: If you want damage, and don't really care about supporting, go for a classic toplane build with triforce and one hydra. This isnt a good idea, so don't do it in ranked. Start Ancient Coin to get more gold without stealing farm.

Elixir: You're obviously going Elixir Of Iron for this build. Start buying Elixir in late game, when you don't have enough gold for last item, or when your build is complete.

Late game example: This is what a late game build can look like.

Trying new stuff: This is a build I've had a lot of fun and success with recently.

Full Support: This is a full support build.

Your E is your bread and butter ability, and you're going to take it lv 1, and max it first. It reduces the cooldown, and gives you more attack speed. You may want to max W first if you really want to poke, but that's very situational and depends on what you need. Use your E to engage, run away, or stun any assassin that want to get close to your ADC. In lane, use it to force trades, don't be scared of trying to go for a quick trade at lv 1 if you feel like it. Don't forget that if you miss your E, you won't get Courage of the colossus proced, you won't get bonus attack speed, and they won't be stunned, so you surely lost the trade.

Use your W to slow chasing opponents and sustain a bit when you're running away, to poke in lane, and to slow opponents you're chasing, really good ability for those situations, you could max it after E, but the advantages are not that big.

Use your Q... well to deal damage. Use it on tower to AA reset and get bonus damage, and use it in trades as I recommend in the "Laning" chapter.

Your R is REALLY GOOD as a support. Use it in lane when you all in their ADC, that way he can't run away, and if his support was near him, bye bye! If you're dominating and want to go for a double kill, ult the farthest ennemy, that way It'll push the other one toward your ADC instead of away. If with Camille Top you would prefer using your R to avoid damage and hard CC, you'll prefer using it to isolate the ADC and allow for easy chase when you're the support.

This is pretty old, but easy to understand. The yellow dots are for checking Baron and Dragon. Red dots are for attacking, blue dots for defending.

Use your brain. Really. Don't go in if you're not sure of your winning chances!

Try to surprise your ennemies, attack from long ranges, from bushes, all-in them with your ult. If your ennemies can predict you, you're probably already dead.

As I said in last tip, being predictable isn't a good idea. How not to be? Try not to attack the same way three times in a row, or they'll understand how to play against you.

Don't be impressed by high damage outputs from your opponents. They mayba deal damage, but jumping on them while they aren't expecting it can result in a dead ennemy. (Think before doing that, though)

Think of the matchup. Don't be overly aggressive if you're getting countered, but exploit the weaknesses of opponents who have issues dealing with you.

Setting ambushes is great as Camille! But remember to ward so that you don't become the ambushed