Think you suck? The story of my improvement.
This originally started out as a reply to this question from a level 29 about why he sucks (his words, not mine). I started a reply but figured maybe it would benefit more people with a little more exposure.
Everybody's got their ideas and secret sauce, and they're all probably better than me, so I won't make any pronouncements. Instead, I'll share my experiences and maybe you can get some ideas.
I have three friends that play LoL. If they were ranked, they'd probably be low silver, high silver, and gold. I downloaded LoL because they didn't like to play Halo, and I just wanted to play a game with video-game-loving friends. My gold friend made a smurf and tried to teach me how to play. The learning curve is real, and I sucked. Eventually I became a decent enough fill that my team could at least win sometimes with me on it. (This was still playing almost exclusively with my friends.) I liked Kog'Maw and Annie at the time; Kog's ult and passive were a lot of fun, and who doesn't like dropping a ten-foot-tall angry teddy bear on their enemies?
One day, around level 20, I tried playing alone, and found that experience playing against higher-level players made me really good against people my own level. I started playing more on my own, and tried to notice what the slightly-better players were doing differently. I wasn't very good at that, but it's something I don't think I was capable of processing with my higher-level friends. I started trying the champions that annoyed me and looked interesting. I learned Teemo. I wasn't very good with him (shrooming is hard) but postmortem poison kills were oh-so-satisfying. I also picked up Garen, Nunu (support), and Vayne, but I'm still not very good with them. I'm slightly better with Cho'Gath.
My gold friend moved away and stopped playing with us as frequently. One night we were both on at the same time and he invited me to an ARAM game. I rolled Sona. I'd never played her before in my life, but I absolutely wrecked face. I was the best player on the team, better even than my gold friend. I was hooked. I'd never supported (except with Nunu, but we will not speak of that here) but I wanted to play more Sona. I learned how to position, rudimentary warding (the extent of which was the bot-lane river bush), when to heal, how to coordinate with the ADC and jungler, when to go all-in and when to retreat. I became a support main.
URF happened. I noticed a lot of champs were OP there, Blitz in particular (to me). I bought him and learned to play support with him too. I quickly learned that a tank with a pull does not synergize well with some ADCs, and learned when I should play Sona vs Blitz. At this point, having been level 30 for six months, I stopped considering myself a new player. Don't fret that you're not good right now. You are still new, and there's no shame in that. You'll get better.
Braum was announced. I almost died. This was a champion made for me. I became a god. This is also where I started learning about situational buys. On Sona you want to rush AP almost always, and on Blitz just buying all the offensive items worked pretty well, but with Braum I learned when to build Aegis vs Randuin's vs Warmog's, the difference between armor and MR and just how valuable those two things are, and the true value of CC.
Having the support role under my belt and knowing that I could fall back on that when I needed to (because who calls support?), I started learning jungle. I quickly learned that I was terrible and moved to top lane. I started wrecking with Jax after learning he was one of the most OP top laners. I tried jungle again, this time with Trundle. I liked his mechanics, so I started watching YouTube guides and learned how to jungle. I learned to jungle Malphite when my team needed a tank. I started watching pro games when All Stars happened this year, and quickly found out that warding was much more important than I'd thought. I learned to rush Sightstone when supporting, and learning to ward quickly improved my shrooming when Teemo top became a thing.
I almost made it into Silver this season, and have a stretch goal to make Gold next season.
So that's my story and maybe you can use some of those things to help you find a role or champ you like. There are really only three things I'd absolutely say to do/not do:
- DO NOT PLAY RANKED until you have a champ and role you like and are good in. Preferably two decent champs each for two or even three roles. Ranked may only require level 30, but really it's closer to level 40 or 50 skill (if you kept levelling up instead of capping at 30). Learn to counterpick too before you go in, or have different enough champs that your teammates can tell you who to play. (I don't play Normal Draft, especially since that's where banned players have to play to reform. This is probably a #bronzelyfe thing, but it works for me. If the situation doesn't call for Braum, Sona will probably do just fine.)
- DO NOT READ MOBAFIRE/LOLKING GUIDES until you are comfortable with a champ. You're still trying to figure out 120 champions; don't throw 200 items into the mix too. Limit yourself to the in-game recommended item set at first. Learn how to buy offensive vs defensive items situationally. There's a reason these items are recommended, and I find they're generally not broken. Mobafire IMO is for learning how to do niche things, and you should have a handle on generalities before you focus on that. Learn what the items do and how they influence your power; this will take you farther than any Lolking guide ever could.
- I wouldn't worry about runes yet. This is in pretty stark contrast to what everyone says, but I think it's more important to find a role, find a champ or two, and then worry about it. If you have more than 10,000 IP—enough for a couple champs, even the more recent ones—then go ahead and start buying a few runes. MR glyphs and armor seals will never hurt you. I'm still filling my first two rune pages per this guide, but you're a noob playing normals. Nobody there cares if you have runes or not (and I got into Bronze I without them, too).