Alright listen up, 'cause I'm gonna give you a show you a few errors that low ELO doesn't unserstand so you'll quickly understand how to get good at the game.
What some people don't understand is that they should have a sense of urgency, don't just farm their jungle when they have 2 enemies down. Group up, take a tower/inhibitor and leave, don't get too greedy.
When things are going your way, send your carry on bot lane and the rest of the team top. They'll have to send 2 people to stop him from sieging and if they do, do Baron Nashor. If they don't team fight/stall them while your carry gets tower/inhibitor, basic macro strats.
Hope I don't have to tell you to ward river, don't be she to ask for a gank on a stalemate/losing lane and keep track of the enemy jungler.
Learn a few lane control strats like freezing, soft pushing and hard pushing to mitigate/negate enemy farm. Accept when you lose lane and do your best to get some CS, ask your jg if you can take a bit of jg if needed.
Now, when is it a good time to do Dragon/Baron?
First Dragon is usually when JG has level 2 or level 3 jg item and bot lane gets a kill or the enemy jungler is down, make sure to ward your lizard friend, he'll help you a lot :3
Other dragons are good when enemy jungler is down and/or when the enemy has 2 ore more people down.
Baron is good with the above condition, but also nice when your team has taken an inhibitor and the Super Minions have ARRIVED in the enemy base. This will force one or two of the enemy team to stay behind to make sure their Nexus Towers are safe.
There you go, quick tutorial, tips and tricks to keep your games in line and get that sweet sweet "Great Shot Caller" Honor!
Want to play a few games? Add my alt @ ArcadeFoxe
(I've been grinding URF for free XP)