Hey there RaidZero4! Sounds like you're in a rut, and I'm here to help! I'm an ADC/SUP main, and I'll try and go over everything point by point:
- For your ADC pool, Sivir and Caitlyn are good places to start. They have massive ranged abilities, and their kits don't require too much mechanics to be effective. For Sivir, you should treat your ult like a panic button; If you see an enemy that can be collapsed on, or if a teammate gets caught out, mash that R key. Most of the time, it'll allow your team to re-position and get their bearings. For Caitlyn, I would try a game where you max your TRAPS (W) first, so you can store more of them per level, and use them to control objectives. When your team goes for baron/dragon/turret, use them at a choke point, or scatter them around the turret. A nifty trick is to put the traps in the "blind spots" behind turrets, so unsuspecting players will get snapped.
I would recommend expanding your ADC pool to include other easy marksmen. Ashe is generally a good blind pick, as she's lane-focused and her ult is always useful. Twitch can also be a dandy pick, as his stealth is a good escape tool, and his ult allows you to free-fire from your backline (keep in mind he has trouble laning, so make sure you go with a support that can hold their own). Miss fortune brings the smack-down in lane dominance, and can build a wide variety of items.
For now, hold off on playing the harder ADC's: Vayne, Lucian, Draven, Kalista, Tristana. These guys require really good judgement and kiting for fights in lane.
In terms of farming, my rule is: if I'm using an ability to last-hit the minions, i use my auto-attacks to make their healthbars low and matching. If i'm using autoattacks to last-hit, I use my abilities and autos to space out their healthbars. This simple technique ensures more gold from the laning phase.
- For jungle, you should treat Master Yi like an adc, and consider your own team comp first. He doesn't provide Crowd Control, so you will have to rely on your laner's CC to effectively gank. I would play junglers with simple CC combos/abilities:
Warwick. His W will tell you if there's a low health enemy, i.e. a good gank target. His E fear is good for pushing enemies toward your team, or disrupting a fight.
Udyr. You run up, and stun who you're ganking with your E. Straightforward, and relies on autoattacks.
Amumu. His ult is an instant-stun, and you don't need to be picky about who you hit with your Q, bandage toss.
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Don't worry about ranked! When you play it, you will probably get an "Oh snap!" feeling, and likely feed. This is how it almost always goes for new players. If you want to try ranked, I recommend turning off the client music, cuz it can add to the pressure of champ select. You will also likely end up in a super-low division after your placements; that's how it goes for everyone's first time.
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For learning a new character, go with who you think looks FUN. When you're getting a feel for what role(s) you want to commit too, you should give everybody you think you will ENJOY. Learning goes fastest when you like doing it!
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In game, if you think your team is going to lose a fight, it's ok to abandon it. Knowing when to cut your losses is a HUGE step in improving your gameplay.
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From the iron-silver divisions, I see a lot of "auto-pilot" players, who have the same habits (dragon/baron without clearing wards, using a spell EVERY time it's off cooldown, always buying recommended items, etc.). If you can learn to pick up on their habits, you can exploit them.
You see the enemy jungler is camping your toplane? Take dragon, steal their jungle, and threaten botlane!
Enemy support always blind checks a bush? Setup a surprise attack with your teammates!
There's actually a page aimed at answering new player's questions over here: https://boards.na.leagueoflegends.com/en/c/general-discussion/IrVl1IQK-new-players-and-parents-click-over-here-help-is-on-the-way. Come check it out sometime![slayer-jinx-wink]