Janna

I say this with bias but I think Janna is one of the best supports in the game. I say this because she has so much potential but most people fail to use her properly. Regardless she is strong in most team comps and has the best peeling ability in the game. Make sure you are able to use Janna's shield properly. If you are unable to use it you are far less effective Use tank runes so you are able to survive. The problem for many new support players is they die to often so you want to make sure that you do everything you can to stay alive.

Lulu

Lulu is a great champions and she brings a lot to the table in team fights. As far as the laning phase goes she has great poke and can wear down the enemies is they don't have heals or life steal. Like Janna, Lulu is very squishy and relies on a shield to be effective. Make sure you are trading properly and not taking free damage. Taking free damage on a support like this is a death wish. Use Lulu's W correctly. If you are chasing use it on friendly champions and if you need peel use it on an enemy

Sona

One of the best supports in the game. Sona is just really good at poking which makes her laning phase phenomenal. That being said she does seem to lose some power in the later stages of the game but her ultimate makes up for it. Area of effect stuns like Sona's are not very common and that is because of how powerful they are. Sona is very squishy so you have to build tank items as fast as you possibly can. Positioning can be tough but it makes the difference between a good and bad Sona. Make sure you land your ults and land them on multiple targets. This can make or break a team fight.

Soraka

Soraka is great at giving resources to your carry champions and the armor buff provides protection. Soraka is, however, very vulnerable to early game aggression especially when her heal is on cooldown. A lot of people think she is the easiest support to play, but she can be very hard if you don't when to heal. Soraka is very hard to play. You have to make sure you stay in the right position and not die.

Alistar

Alistar is very strong because his crowd control is very powerful. He can use is abilities to set up kills in the laning phase and then transition to using his abilities to protect his carries. He can be used as a jungler but is also a very strong support as well. If you are new to Alistar do not try and combo. It is very hard to use and is unforgiving if you fail it. Try to use walls to headbutt against and then pulverize.

Nami

Nami channels the primal energies of the ocean, harnessing its mystical restorative properties and commanding the raw power of the tides themselves. Though many doubted her, Nami had the bravery and determination to take on a dangerous quest when no one else would. Now her people believe she is the Tidecaller, a chosen one destined to complete a quest essential to the survival of her entire race.