Hey, I'm currently on a forum smurf but I'm a Season 2 2.1k support only player. You can take a look at Ji Style, my main.
Season 2, I had 450+ ranked janna games,
350+ ranked taric games,
250+ ranked soraka games,
150+ ranked sona games,
and couple more games with lulu, leona and nunu.
My alistar isn't the best and I'm totally bad at blitz, so I won't talk about them much.
Sona received a lot of defensive nerfs, which makes her very early level poke not very rewarding if she is getting harassed back.
First, let me go into the basics - I'm running a basic support rune page, but instead of gp5 seals I go for mregen per level seals, which will help you last longer in lane phase.
That said, I'm very passive my first 2 levels, and once I hit 3 I get aggressive.
I start with faerie charm 3 wards and 3 pots. With poke champions, you really want to go 3 pots.
Never poke when you are under 50~60% hp, because that makes you in a very dangerous situation where the enemy duo can easily burst you down.
The best levels to harass is level 3 and level 5, which is the levels when you can rank up your Qs.
Q damage does seem weak at level 4, and I like to save up mana for heavy poking at level 5 and try to go for a kill once I hit 6.
When poking, make sure you can hit as much auto attacks as possible. There is a big difference between a regular Q harass and an auto->Q / Q->auto harass which gets the most out of your Q and its passive aura.
When your AD is farming under tower, keep your Q up and he'll have an easy time farming under tower.
When your passive have 2 or 3 stacks, I usually don't use heal. That is to make sure I can either Q powerchord or E powerchord, and I don't see myself using W powerchord that often.
When your team is taking towers, dragon or baron, use Q, wait for its CD to refresh, then use W to heal the allies that are tanking and then use Q again right away, and repeat. This makes sure you always have the Q aura up which increases the attack damage and ability power of your nearby allies, which helps you take the two objectives a lot faster.
Other than that, when I'm chasing, I use QWE to get my slow up, hit the target, and repeat. It's an infinite slow pretty much.
My skill order is
Q W Q E Q R which is always same for every game unless something crazy happens, and if lane phase goes longer, I get Q W Q E, and if lane phase is ending early, I go Q E Q E.
Always max out E as soon as you can once you get out of lanephase, because that **** is just really op.
In high level play, it is best for a support to buy wards and then buy items with the left over money, but in lower level play, it is better to buy items and buy wards with leftover money just because lower ranked players do not make much out of wards all around the map.
Go Philo as soon as you can and then buy HoG before boots if you can buy it in 1 purchase. If you don't have enough for a HoG, get boots and wards.
Faster GP10 = more income = even faster GP10 ; this means that GP10 snowballs really fast.
Buy a 3rd GP20 if you can get it around 15 minutes, but if you are at around 20 minute mark with only 2 GP10, start building your reverie.
And usually, the game should end there. These days, junglers/top goes aegis which means you should go Zekes as your second item if the game even reaches there.
Add me, Ji Style, in game if you wanna talk more about the role