Well, first remember it's a game and it's a lot of fun!
After that important step, here are some things I think might help, they focus on what it means to be a support to you, so ask yourself that question. What does it mean to be a support, what do you like your supports to do in games you are not one for instance... im going to gander at warding and making a play....
- Warding... easy to say, sometimes hard to do. In lower elo support will often carry the team in wards, this means vision will be limited to where you are, or where you want to see. Control the vision you think is most important. Learn to read the other team, do they gank bot, is the enemy jg a roamer? Do they go after objectives such as Baron and Dragon? Also a friendly reminder that a pink ward is a 1 time expense can really help, and in a low elo game 1 pink can really last the entire game, or at least long enough to have been worth it...
does the enemy support counter ward? Did they buy a seeker? don't be shy to go back and refresh your ward stack, when safe, and warn the adc... toss down a ward in the same spot an old one is at if it is expiring and u are going back with wards on stone.
if warding is a high priority, and since vision lets u see the gank coming for you it is... then that means some safety is needed when warding... i think that comes in the form of mobility atm for supports.... speed = safety....
are cheaper, and give better movement when warding, (also the utility mastery which extends placements of wards is nice) toss wards from safer area's (think warding red bush from krug)
if you are a warding machine, then depending on the situation, homeguard should be one of your purchases..... it allows u to go back restock on wards, and get back out faster
- play-making.... its been said supports start the killing but dont finish it, if you realize that your adc is learning to farm and not recognizing your initiations, well then you have a few options....
a- keep on keeping on and go for the kill next time instead of letting them get away, a kill is better than no kill, every time the adc says ks! agree, let them know how excited you are that you were able to secure the kill for the team and now they can farm those minion waves risk free as you go and ward the rvr, bushes, and everything else around u since you prob have to go back and buy now... but its safer to do so because the enemy is dead
b- pings r ur friends, they r the friend of the adc who is free farming as well, ping before u go in, ping when you pull back, ping when u do... anything....if appropriate, and im not talking about spamming or in anger.... if they want to ignore it fine, if they ask u to stop, fine, but a lot of people in lower elo just have not yet developed the skill needed to pay attention to so many things at once, and a glaring reminder in the form of a visual and audio alert can really help them..... same with warding rvr when pushing the enemy, they have a trink, and i ur ward has expired and they have not thrown theres into the rvr.... toss out ? on the rvr bush, and play farther back, or protect the rvr as a living ward, (most ganks at lower elos are from the rvr, not tri and u have a pink in tri prob anyways)
c- stop initiating..... look at who might be a good carry on the team, and play as defensively as you can, let the adc know you want to be more defensive.... u prob died having to get to this step, so ur not wrong in doing so.... during other points in the game, focus on the carry with the most potential, not just the adc u started bot with....
well, a few thoughts.... here's to happy supporting